Phn VII:Lng t nh sng - TM TT CHNG BY.I Hin tng quang in ngoi Cc nh lut quang in.1. Hin tng quang in ngoi. - Hin tng nh sng lm bt cc lectron ra khi b mt kim loi gi l hin tng quang in ngoi. Gi tt l hin tng quang in.- Cc electron b bt ra ngoi khi b chiu sng gi l cc quang electron (electron quang in).2. Cc nh lut quang in.a. nh lut I (nh lut v gii hn quang in). Hin tng quang in ch xy ra vi nhng nh sng kch thch chiu vo kim loi c bc sng nh hn hoc bng bc sng 0, 0 c gi l gii hn quang in ca kim loi : 0 .b. nh lut II (nh lut v dng quang in bo ha).i vi mi nh sng thch hp (c 0 ), cng dng quang in bo ha t l vi cng ca chm sng kch thch.c. nh lut III (nh lut v ng nng cc i ca quang electron). ng nng ban u cc i ca cc quang electron khng ph thuc cng ca chm sng kch thch m ch ph thuc bc sng ca nh sng kch thch v bn cht kim loi.II Thuyt lng t nh sng. Lng tnh sng - ht ca nh sng.1. Thuyt lng t (ca Plng). Lng nng lng m mi ln mt nguyn t hay phn t hp th hay pht x c gi tr hon ton xc nh, gi l lng t nng lng. Lng t nng lng k hiu l c gi trbng:hf trong f l tn s ca nh sng b hp th hay pht ra; cn h l mt hng s gi l hng s Plng, h = 6,625.10-34J.s 2. Thuyt lng t nh sng (ca Anh-xtanh). Phtn.- Chm sng l mt chm ht, mi ht gi l mt phtn (lng t nh sng). Mi photon c nng lng x nh hf . Vi mi nh sng n sc c tn s f, cc phtn u ging nhau (v khng ph thuc vo khong cch t phtn n ngun sng), mi phtn mang nng lng bng hf. Cng ca chm sng t l vi s photon pht ra trong 1 giy.- Mi ln mt nguyn t hay phn t pht x hay hp th nh sng th chng pht ra hay hp th mt phtn.- Phtn bay vi tc c = 3.108m/s dc theo cc tia sng.Khng c phtn trng thi ngh.Cng thc Anh xtanh dng gii thch cc nh lut quang in: 20max12hf A mv +3. Lng tnh sng - ht ca nh sng.- nh sng c lng tnh sng - ht.- Bc sng cng di tnh sng cng r hn tnh ht. Bc sng cng ngntnh htcngr hn tnh sng- Tnh ht:Th hin hin tng quang in, lm pht quang cc cht, m xuyn, ion ha- Tnh sng:Th hin hin tng giao thoa, nhiu x, tn scIII Hin tng quang in trong. Quang in tr v pin quang in.1. Hin tng quang in trong.a. Hin tng quang in trong. Hin tng nh sng c bc sng thch hp chiu vo cht bn dn lm gii phng cc lectron lin kt chng tr thnh cc letron dn ng thi l trng cng tham gia vo qu trnh dn in gi l hin tng quang in trong.- Nng lng cn thit gii phng electron trong cht bn dn thng nh hn cng thot A ca electron t mt kim loi nn gii hn quang in ca cht bn dn thng ln gii hn quang in ca kim loi. Gii hn quang in ca nhiu cht bn dn nm trong vng nh sng hng ngoi.b. Hin tng quang dn. - Cht quang dn: l cht dn in km khi khng b chiu sng v tr thnh dn in tt khi b chiu nh sng thch hp.- Hin tng quang dn l hin tng gim mnh in tr sut tc tng dn in ca cht bn dn khi c nh sng thch hp chiu vo.2. Quang in tr.L mt in tr lm bng cht quang dn. in tr ca quang in tr c th thay i t vi mgam khikhng c chiu sng xung n vi chc m khi c chiu nh sng thch hp.3. Pin quang in (pin mt tri). L mt ngun in chy bng nng lng nh sng. Bin i trc tip quang nng thnh in nng. Hiu sut trn di 10%. Pin hot ng da vo hin tng quang in trong xy ra bn cnh mt lp chn. Cu to: Pin c 1 tm bn dn loi n, bn trn c ph mt lp mng bn dn loi p, trn cng l mt lp kim loi rt mng. Di cng l mt kim loi. Cc kim loi ny ng vai tr cc in cc tr. Gia p v n hnh thnh mt lp tip xc p-n. Lp ny ngn khng cho e khuych tn t n sang p v l trng khuych tn t p sang n gi l lp chn. Hot ng : Khi chiu nh sng c 0 s gy ra hin tng quang in trong. lectron i qua lp chn xung bn dn n, l trng b gi li in cc kim loi mng trn nhim in (+) in cc(+), cn kim loi nhim in (-) in cc (-).- Sut in ng ca pin quang in t 0,5V 0,8VIV. Mu nguyn t Bo v quang ph vch ca nguyn t Hir.1. Mu nguyn t Bo.a. Tin v trng thi dng.- Nguyn t ch tn ti trong mt s trng thi c nng lng xc nh En, gi l cc trng thi dng. Khi trng thi dng, nguyn t khng bc x.- Bnh thng, nguyn t ch tn ti trng thi c nng lng thp nht gi l trng thi c bn. Khi hp th nng lng th nguyn t chuyn ln cc trng thi dng c mc nng lng cao hn, gi l trng thi kch thch. Thi gian sng trung bnh ca cc nguyn t trn trng thi kch thch rt ngn ch c 10-8s. Sau nguyn t chuyn v cc trng thi dng c nng lng thp hn v cui cng v trng thi c bn.- Trong cc trng thi dng ca nguyn t th cc electron chuyn ng trn cc qu o trn c bn knh hon ton xc nh, gi l cc qu o dng. - Bn knh qu o dng th n c xc nh: 20 nr n r Trong 0rgi l bn knh qu o Bo l bn knh ca electron khi nguyn t trng thi c bn v 1105, 3.10 r m .b. Tin v bc x v hp th nng lng ca nguyn t.- Khi nguyn t chuyn t trng thi dng c nng lng Em sang trng thi dng c nng lng En nh hn (vi Em > En) th nguyn t pht ra mt phtn c nng lng ng bng hiu Em En: mn m nhf E E (fmn: tn s nh sng ng vi phtn ).- Ngc li nu nguyn t ang trng thi dng c nng lng En thp m hp th 1 phtn c nng lng h.fmn ng bng hiu Em En th n chuyn ln trng thi dng c nng lng Em ln hn. Ch :Nu phtn c nng lng mnhf m n mn mE hf E < < th nguyn t khng nhy ln mc nng lng no m vn trng thi dng ban u.2. Quang ph vch ca nguyn t Hir.Gm nhiu vch xc nh, tch ri nhau (xem hnh v). trng thi bnh thng (trng thi c bn) nguyn t H c nng lng thp nht, electron chuyn ng trn qu o K.Khi c kch thch, cc electron chuyn ln cc qu o cao hn (L, M, N, O, P...). Nguyn t ch tn ti mt thi gian rt b (10-8s) trng thi kch thch sau chuyn v mc thp hn v pht ra phtn tng ng.- Khi chuyn v mc K to nn quang ph vch ca dy balmer.- Khi chuyn v mc M: to nn quang ph vch ca dy Paschen.* S mc nng lng- Dy Laiman: Nm trong vng t ngoi. ng vi e chuyn t qu o bn ngoi v qu o KLu : Vch di nht LK khi e chuyn t L KVch ngn nht K khi e chuyn t K.- Dy Banme: Mt phn nm trong vng t ngoi, mt phn nm trong vng nh sng nhn thy.ng vi e chuyn t qu o bn ngoi v qu o L Vng nh sng nhn thy c 4 vch: Vch H ng vi e: M LVch lam H ng vi e: N L Vch chm H ng vi e: O L Vch tm Hng vi e: P L Lu : Vch di nht ML (Vch H)Vch ngn nht L khi e chuyn t L.- Dy Pasen: Nm trong vng hng ngoi. ng vi e chuyn t qu o bn ngoi v qu o MLu : Vch di nht NM khi e chuyn t N M.Vch ngn nht M khi e chuyn t M.V. Hp th v phn x lc la nh sng. Mu sc cc vt.1. Hp th nh sng.- Hin tng mi trng vt cht lm gim cng ca chm sng truyn qua n gi l hin tng hp th nh sng. nh lut v s hp th nh sng: Cng I ca chm sng n sc khi truyn qua mi trng hp th, gim theo nh lut hm s m ca di ca ng i ca tia sng:0dI I e Vi I0 l cng ca chm sng ti mi trng, l h s hp th ca mi trng. Hp th lc la: nh sng c bc sng khc nhau th b mi trng hp th nhiu hay t khc nhau. Ni cch khc s hp th ca nh sng ca mt mi trng c tnh chn lc- Nhng cht hu nh khng hp th nh sng trong min no ca quang ph c gi gn trong sut vi min quang ph .- Nhng vt khng hp th nh sng trong min nhn thy ca quang ph c gi l vt trong sut khng mu. Nhng vt hp th hon ton nh sng nhn thy th c mu en.2. Phn x (hoc tn x) lc la. Mu sc cc vt.- mt s vt, kh nng phn x (hoc tn x) nh sng mn yu khc nhau ph thuc vo bc sng ca nh sng ti. l phn x (hoc tn x) lc la.- Mu sc cc vt ph thuc vo vt liu cu to ca vt v mu sc ca nh sng ri vo n.VI. S pht quang. S lc v Laze.1. Hin tng pht quang.- C mt s cht ( th rn, lng hoc kh)khi hp th nng lng di mt dng no th c kh nng pht ra cc bc x in t trong min nhn thy. Cc hin tng gi l s pht quang.- Mi cht pht quang c mt quang ph c trng cho n; sau khi ngng kch thch, s pht quang ca mt s cht cn tip tc ko di thm mt khong thi gian no ri mi ngng hn. Khong thi gian t lc ngng kch thch n lc ngng pht quang gi l thi gian pht quang.- Ty theo thi gian pht quang ngi ta chia lm 2 loi pht quang: + Hunh quang: l s pht quang c thi gian pht quang ngn (di 10-8s), ngha l nh sng pht quang hu nh tt ngay sau khi tt nh sng kch thch. N thng xy ra vi cht lng v cht kh.+ Ln quang: L s pht quang c thi gian pht quang di (10-8s tr ln). N thng xy ra vi cht rn. Cc cht rn pht quang loi ny gi l cht ln quang. nh lut Xtc v s pht quang: nh sng pht quang c bc sng' di hn bc sng ca nh sng kch thch :' > . ng dng: cc loi hin tng pht quang c rt nhiu ng dng trong khoa hc, k thut v i sng nh s dng trong cc n ng thp sng, trong cc n mn hnh ca dao ng k in t, ca tivi, my tnh, s dng sn pht quang qut ln cc bin bo giao thng.2. S lc v Laze.a. S pht x cm ng.- Nu mt nguyn t ang trng thi kch thch, sn sng pht ra mt phtn c nng lng hf , bt gp mt phtn c nng lng' ng bng hf bay lt qua n, th lp tc nguyn t ny cng pht ra photon c cng nng lng v bay cng phng vi phtn' . - Sng in t ng vi phtn hon ton cng phav dao ng trong mt mt phng song song vi mt phng dao ng casng in t ng vi phtn' . b. Laze v c im.- Laze l mt ngun pht ra mt chm sng cng ln da trn vic ng dng ca hin tng pht x cm ng.- c im: - Tnh n sc rt cao- L chm sng kt hp- C tnh nh hng cao.- C cng ln.c. Cc loi laze.- Laze kh, nh laze He Ne, laze CO2.- Laze rn, nh laze rubi.- Laze bn dn, nh laze Ga Al As.Laze bn dn l loi Laze s dng ph bin hin nay.d. Mt vi ng dng ca laze.- Thng tin lin lc: s dng trong v tuyn nh v, lin lc v tinh, truyn tin bng cp quang - Y hc: dao m trong phu thut mt, cha bnh ngoi da (nh tc dng nhit) - Dng trong cc u c a CD, bt tr bng, - Dng khoan, ct, ti chnh xc cc vt liu cng nghip.Chuyn 58:Xc nh cc i lng c trng 0, A, max 0v, bhI, hU. Nng lng photon.A. Tm tt l thuyt v cng thc: p dng cc cng thc lin quan n hin tng quang in:- Nng lng ca photon:2c mhchfph - ng lng ca photon:chc m pph ,mph l khi lng tng i tnh ca photon.- Gii hn quang in:0hcA - Phng trnh Anhxtanh:2012maxhf A mv +- Bc x n sc (bc sng) c pht ra v nng lng ca mi xung l E th s photon pht ra trong mi giy bng:hcEhfE En - Vn tc ban u cc i: mhcv

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0max 01 12 (trong 2510 . 9875 , 1 hc )- in p hm: 212omax hmv eU - Vt dn c chiu sng: max2max 021V e mv

( maxV l in th cc i ca vt dn khi b chiu sng)- Nu in trng cn l u c cng E v electron bay dc theo ng sc in th: max2max 021Ed e mv (maxd l qung ng ti a m electron c th ri xa c Catot.Ch : Nu chiu vo Catt ng thi 2 bc x1, 2 th hin tng quang in xy ra i vi bc x c bc sng b hn 0 ( )0f f >. Nu c 2 bc x cng gy ra hin tng quang in th ta tnh ton vi bc x c bc sng b hn.B. Bi tp c hng dn:V d 1: Catt ca mt t bo quang in c cng thot bng 3,5eV.a. Tm tn s gii hn v gii hn quang in ca kim loi y.b. Khi chiu vo catt mt bc x c bc sng 250 nm- Tm hiu in th gia A v K dng quang in bng 0.- Tm ng nng ban u cc i ca cc lectron quang in.- Tm vn tc ca cc lectron quang in khi bt ra khi K.Hng dn gii:a. Tn s gii hn quang in:f = c/0 = A/h = 3,5.1,6.10-19/(6,625.10-34) = 0,845.1015 Hz.Gii hn quang in:o = hc/A = 6,625.10-34.3.108/3,5.1,6.10-19= 3,55.10-7m.b. dng quang in trit tiu th cng ca in trng phi trit tiu c ng nng ban u cc i ca lectron quang in.2 2 34 819 0 019 81 1 6, 625.10 .3.10( ) ( 3, 5.1, 6.10 )2 2. 1, 6.10 25.10h hmv mv hceU U Ae e Uh = - 1,47 Vng nng ban u cc i 201, 472hmveU eV = 2,352.10-19J.W=

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8 88 3402010 . 5 , 35110 . 25110 . 3 . 10 . 625 , 61 1hc2mv=0,235.10-18J Vn tc ca lectron 53118010 . 19 , 710 . 1 , 910 . 235 , 0 . 2 2 mWvm/s.V d 2: Khi chiu bc x c bc sng 0,4 m vo catt ca mt t bo quang in, mun trit tiu dng quang in th hiu in th gia A v K bng -1,25V.a. Tm vn tc ban u cc i ca cc e quang in.b. Tm cng thot ca cc e ca kim loi lm catt (tnh ra eV).Hng dn gii:a. 311902max 010 . 1 , 925 , 1 . 10 . 6 , 1 . 2 2| |2 meUv eUmvhh= 0,663.106 m/s.b. Cng thot:( )34 822 31 60max 61 6, 625.10 .3.10 1.9,1.10 . 0, 663.102 0, 4.10 2hcA mv eV J 855 , 1 10 . 97 , 219 .V d 3: Cng thot ca vnfram l 4,5 eVa. Tnh gii hn quang in ca vnfram.b. Chiu vo tm vnfram mt bc x c bc sng th ng nng ban u cc i ca lectron quang in l 3,6.10-19J. Tnh .c. Chiu vo tm vnfram mt bc x c bc sng . Mun trit tiu dng quang in th phi cn mt hiu in th hm 1,5V. Tnh ?Hng dn gii:a. 276 , 010 . 6 , 1 . 5 , 410 . 3 . 10 . 625 , 6Ahc198 340 m.b. 34 819 196, 625.10 .3.100,1844, 5.1, 6.10 3, 6.10hc hcA WA W + + + m.c. ( ) ( )34 819 196, 625.10 .3.10' 0, 207' 4, 5.1, 6.10 1, 5 . 1, 6.10hhhc hcA eUA eU + + + m.V d 4: Cng ti thiu bc mt lectron ra khi b mt mt tm kim loi ca mt t bo quang in l 1,88eV. Khi chiu mt bc x c bc sng 0,489 m th dng quang in bo ha o c l 0,26mA.a. Tnh s lectron tch ra khi catt trong 1 pht.b. Tnh hiu in th hm trit tiu hon ton dng quang in.Hng dn gii:a. Ibh = ne = 26.10-5A. (n l s lectron tch ra khi catt trong 1s).n = 1419510 . 25 , 1610 . 6 , 110 . 26; S lectron tch ra khi K trong 1 pht: N=60n = 975.1014.b.eV eV Ahc mveUh66 , 0 88 , 1 54 , 2 88 , 110 . 6 , 1 . 10 . 489 , 010 . 3 . 10 . 625 , 6219 68 34 20 Hiu in th hm Uh = 0,66V. V d 5: Catt ca t bo quang in lm bng xdi (Cs) c gii hn quang in 0=0,66 m. Chiu vo catt bc x t ngoi c bc sng =0,33 m. Hiu in th hm UAK cn t gia ant v catt trit tiu dng quang in l bao nhiu?Hng dn gii: trit tiu dng quang in, cng ca lc in trng phi trit tiu c ng nng ban u cc i ca quang lectron (khng c mt lectron no c th n c ant)( )( )2 34 80max6 190 0 06, 625.10 .3.101, 882 0, 66.10 . 1, 6.10AK AKmv hc hc hc hceU U Ve Nh vy trit tiu hon ton dng quang in th: UAK 1,88V.V d 6: Khi chiu ln lt hai bc x c bc sng 0,25 m v 0,3 m vo mt tm kim loi th vn tc ban u cc i ca cc lectron quang in ln lt l 7,31.105 m/s v 4,93.105 m/s.a. Tnh khi lng ca cc lectron.b. Tnh gii hn quang in ca tm kim loi.Hng dn gii:a. 2mvAhc2max 011+ ;2mvAhc2max 022+ )2v2v( m1 1hc2max 022max 012 1

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6 6 10 108 342 12max 022max 0110 . 3 , 0110 . 25 , 0110 . 3049 , 24 10 . 4361 , 5310 . 3 . 10 . 625 , 6 . 2 1 1 2 v vhcmm= 1,3645.10-36.0,667.106= 9,1.10-31 kg.b. Gii hn quang in:( )Jmv hcAmvAhc1925 3168 34 2max 0112max 01110 . 52 , 5210 . 31 , 7 . 10 . 1 , 910 . 25 , 010 . 3 . 10 . 625 , 622 +

m mAhc 36 , 0 10 . 6 , 310 . 52 , 510 . 3 . 10 . 625 , 67198 340 V d 7: a. Khi mt cht b kch thch v pht ra nh sng n sc mu tm c bc sng 0,4 m th nng lng ca mi phtn pht ra c gi tr l bao nhiu? Bit h =6,625.10-34Js; c =3.108 m/s.b. i vi nguyn t hir, khi lectron chuyn t qu o M v qu o K th nguyn tpht ra phtn c bc sng 0,1026 m. Ly h = 6,625.10-34J.s, e = 1,6.10-19 C v c = 3.108m/s.Nng lng ca phtn ny bng bao nhiu? Nu photon ny truyn vo nc c chit sut 34 n th nng lng ca n thay i th no?Hng dn gii:a. Nng lng ca photon tng ng: 1968 34min10 . 97 , 410 . 4 , 010 . 3 . 10 . 625 , 6 hc J.b. Nng lng ca photon tng ng: 34 819 6 196, 625.10 .3.1012,1.1, 6.10 0,1026.10 .1, 6.10hc eVTn s ca nh sng s khng thay i khi truyn qua cc mi trng khc nhau nn nng lng ca n cng khng thay i khi truyn t khng kh vo nc.V d 8:Cng thot lectron ca mt kim loi l 7,64.10-19J. Chiu ln lt vo b mt tm kimloi ny cc bc x c bc sng l 1 = 0,18 m, 2 = 0,21 mv 3 = 0,35 m . Ly h = 6,625.10-34J.s, c = 3.108 m/s. a. Bc x no gy c hin tng quang in i vi kim loi ?b. Tnh ng nng ban u cc i ca cc electron quang in.c. Tnh ln ca in p trit tiu dng quang in trn.Hng dn gii:a. Gii hn quang in : 34 80 196, 625.10 .3.100, 267, 64.10hcmA Ta c : 1, 2 < 0 ; vy c hai bc x u gy ra hin tng quang in cho kim loi .b. 1, 2 gy ra hin tng quang in, chng ta hy tnh ton cho bc x c nng lng ca photon ln hn (bc x 1)b. Theo cng thc Einstein :max 01W Ahc+ J AhcW19 1968 341max 010 . 4 , 3 10 . 64 , 710 . 18 , 010 . 3 . 10 . 625 , 6 Mt khc :s m s mmWv mv W/ 10 . 65 , 8 / 86465010 . 1 , 910 . 4 , 3 . 2 . 22153119max 0max 02max 0 max 0 c. ln in p trit tiu dng quang in : VeWU U e Wh h 125 , 210 . 6 , 110 . 4 , 31919max 0max 0 V d 9: Ngun Laser mnh pht ra nhng xung bc x c nng lngJ E 3000 . Bc x pht ra c bc sng nm 480 . Tnh s photon trong mi bc x ?Hng dn gii:Gi s photon trong mi xung l n. Nng lng ca mi xung Laser: n E ( l nng lng ca mt photon) 218 34910 . 25 , 710 . 3 . 10 . 625 , 610 . 480 . 3000 hcE En photonV d 10:Thc hin tnh ton tr li cc cu hi sau:a. Electron phi c vn tc bng bao nhiu ng nng ca n bng nng lng ca mt photon nh sng c bc sng 05200 A ?b. Nng lng ca photon phi bng bao nhiu khi lng ca n bng nng lng ngh ca electron? Cho khi lng ngh ca electron l kg me3110 . 1 , 9.Hng dn gii:a. Theo bi ra: hcWe hcv me 221s mmhcve/ 10 . 17 , 910 . 5200 . 10 . 1 , 910 . 3 . 10 . 625 , 6 . 2 2510 318 34 b. Nng lng ca photon:2c m EphKhi lng ca electron bng khi lng ngh ca electron ( )e phm m nn: ( ) MeV J c m Ee51 , 0 10 . 19 , 8 10 . 3 . 10 . 1 , 91428 31 2 V d 11: Cho cng thot ca ng bng 4,47eV.a. Tnh gii hn quang in ca ng?b. Chiu bc x c bc sng m 14 , 0 vo qu cu bng ngt xa cc vt khc th qu cu c tch n in th cc i bng bao nhiu? Tnh vn tc ban u cc i ca cc electron quang in ?c. Chiu bc x in t vo qu cu bng ng t xa cc vt khc th qu cu c tch n in th cc i V V 3max. Tnh bc song ca bc x v vn tc ban u cc i ca cc electron quang in trong trng hp ny?Hng dn gii:a. nm mAhc278 10 . 27890 b. Theo cng thc Einstein: 2max 021mv Ahc+ M in th cc i ca vt tnh theo cng thc:max2max 021V e mv + maxV e AhcVeAhcV 4 , 410 . 6 , 110 . 6 , 1 . 47 , 410 . 14 , 010 . 3 . 10 . 625 , 6191968 34maxLi c: max2max 021V e mv s mmV ev / 10 . 244 , 110 . 1 , 94 , 4 . 10 . 6 , 1 . 2. 263119maxmax 0 c. Tng t cu b: + 'maxV e Ahcnm mV e Ahc166 10 . 1669'max +

'max2max 021V e mv s mmV ev / 10 . 03 , 1. 26'max 'max 0 C. Cu hi v bi tp t luyn tp:2604. Catt ca t bo quang in lm bng Cs c 0 = 0,6 m. Cho khi lng lectron l m = 9,1.10-31 kg, in tch lectron l e = 1,6.10-19C; hng s Plng l h = 6,625.10-34Js, vn tc nh sng trong chn khng c = 3.108m/s. Chiu vo catt bc xc bc sng = 0,33 m.. trit tiu dng quang in UAK phi tho mn:A. UAK - 1,70V. B. UAK - 2,04V. C. UAK - 1,16V. D. UAK - 2,35V.2605. Chiu tia t ngoi c bc sng 0,25 m vo catt ca t bo quang in ph Na c gii hn quang in 0,5 m . Cho hng s Plng l h = 6,625.10-34Js, vn tc nh sng trong chn khngc = 3.108m/s. ng nng ban u cc i ca lectron quang in lA. 2,75.10-19 J. B. 3,97. 10-19 J. C. 4,15. 10-19 J. D. 3,18. 10-19 J. 2606. Nng lng ca photon ng vi nh sng tm c = 0,41m l:A. 4,85.10-19J B. 4,85.10-25JC. 3,03ev D. Av C u ng2607. Khi chiu 2 nh sng c tn s f1 = 1015Hz v f2 = 1,5.1015Hz vo mt kim loi lm katt th t s cc ng nng ban u cc i cc electron quang in l bng 3. Tn s gii hn ca kim loi d lA. 1015Hz B. 1,5.1015Hz C. 7,5.1014Hz D. Gi tr khc2608. Gii hn quang in ca Natri l 0,5m th cng thot ca electron khi b mt kim loi lA. 3,97.10-19J B. 0,25.10-19J C. 4,42.10-19J D. Gi tr khcDng bi ny tr li cc cu 2609, 2610, 2611: Chiu mt bc x c bc sng 0,18 m vo bn m ca mt t bo quang in. Kim loi dng lm m cc c gii hn quang in l 00, 3 m 2609. Tm cng thot ca in t bt ra khi kim loiA.190, 6625.10(J) B.496, 625.10(J) C.196, 625.10(J) D.490, 6625.10(J)2610. Tm vn tc ban u cc i ca cc quang electronA.50, 0985.10 m/s B.50, 985.10 m/s C.59, 85.10 m/sD.598, 5.10 m/s 2611. trit tiu dng quang in ta phi t vo anod v catod mt hiu in th hm Uh bng bao nhiu?A.2,76V B.-27,6V C.-2,76V D.-0,276V2612. Bit gii hn quang in ca mt kim loi l 0, 36 m . Tnh cng that electron. Choh =346, 625.10Js; c = 83.10 m/sA.195, 52.10J B.1955, 2.10J C.190, 552.10J D.19552.10J2613.Gii hn quang in km l 0, 36 m , cng thot ca km ln hn ca natri l 1,4 ln. Tm gii hn quang in ca natriA.0,504m B.0,504mm C.0, 504 m D.5, 04 m 2614.Chiu chm sng c bc sng 04000 A vo t bo quang in. Tm hiu in th hm, bit cng thot ca kim loi lm catod l 2eVA.Uh = -1,1V B.Uh = -11V C.Uh = -0,11V D.Uh = 1,1V bi ny dng tr li cc cu 2615, 2616, 2617:Catod ca mt t bo quang in c cng thot A = 3,5eV. Cho h = 346, 625.10Js; m = 319,1.10kg; e191, 6.10C2615. Tnh gii hn quang in ca kim loi dng lm catodA.355 m B.35, 5 m C.3, 55 m D.0, 355 m 2616. Tm vn tc ban u cc i ca cc electron quang in bt ra khi catod khi c chiu sng bng bc x c bc sng 0, 25 m A.50, 718.10 / m s B.57,18.10 / m s C.571,8.10 / m s D.50, 0718.10 / m s2617. Tm hiu in th cn phi t gia anod v catod lm trit tiu hon ton dng quang inA.-0,146V B.1,46V C.-14,6V D.-1,46V bi ny dng tr li cc cu 2618, 2619, 2620:Cng thot ca electron khi ng l 4,47eV. Cho h = 346, 625.10Js; c = 83.10 m/s; me = 319,1.10kg; e = 191, 6.10C2618. Tnh gii hn quang in ca ngA.0, 278 m B.2, 78 m C.0, 287 m D.2, 87 m 2619. Khi chiu bc x in t c bc sng 0,14 m vo mt qu cu bng ng t xa cc vt khc th qu cu c tch in n in th cc i. Khi vn tc cc i ca quang electron l bao nhiu?A.61, 24.10 m/s B.612, 4.10 m/s C.60,142.10 m/s D.61, 42.10 m/s2620. Chiu mt bc x in t vo mt qu cu bng ng t xa cc vt khc th qu cu t c in th cc i 3V. Hy tnh bc sng ca bc x v vn tc ban u cc i ca quang electron?A.7 60 ax1, 66.10 ; 1, 03.10 /mv m s B.7 60 ax16, 6.10 ; 1, 03.10 /mv m s C.7 60 ax1, 66.10 ; 10, 3.10 /mv m s D.7 60 ax16, 6.10 ; 10, 3.10 /mv m s 2621. Chiu mt bc x c bc sng 0, 450 m vo b mt catod ca mt t bo quang in ta c dng quang in bo ha c cng i. C th lm trit tiu dng quang in ny bng mt hiu in th hm Uh = 1,26V. Tnh vn tc ban u cc i ca electron quang in cho e = 191, 6.10C; m = 319,1.10kgA.60, 0666.10 / m s B.60, 666.10 / m s C.66, 66.10 / m s D.666, 6.10 / m s2622. Gii hn quang in ca Rubi l 00,81 m .Xc nh vn tc cc i ca cc electron quang in khi chiu nh sng n sc c bc sng 0, 40 m vo Rubi:A. 0,744.105m/s B. 7,44.105m/s c. 0,474.105m/s D. 4,74.105m/s2623. Nng lng ti thiu bc mt electron ra khi mt mt kim loi Csi l 1,88eV. Dng tm kim loi lm catt ca mt t bo quang in. chiu vo tm kim loi y 1 nh sng c bc sng 0, 489 m th c dng quang in chy qua t bo quang in. trit tiu dng quang in trn ta phi t vo gia ant v catt mt hiu in th hm bng bao nhiu:A. 0,66V B. 6,6V C. -0,66V D. -6,6V2624. trit tiu dng quang in ta dng hiu in th hm 3V, vn tc ban u cc i ca electron quang inA. 2,03.105m/sB. 2,03.106m/s C. 1,03.105m/s D. 1,03.106m/s2625. Chiu nh sng c bc sng 0, 35 m vo catt ca mt t bo quang in, bit kim loi dng lm catt c cng thot 2,48eV, khi ta c dng quang in. trit tiu dpngf quang in ny ta phi t gia ant v catt mt hiu in th hm bng bao nhiu:A. -1,07V B. 1.07V C. 0.17V D. -10,7V2626. Chiu bc x c bc sng 0, 438 m vo catt ca t bo quang in. Cho h = 346, 625.10Js; c = 83.10 m/s; 19 311, 6.10 ; 9,1.10 e C m kg . Tnh vn tc ban u cc i ca cc quang in t (nu c) khi catt l km c cng thot A0 = 56,8.10-20J v khi catt l kali c gii hn quang in 00, 62 m A. Xy ra i vi catt l kali v v0 = 0,541.106 m/sB. Xy ra i vi catt l kali v v0 = 5,41.106 m/sC. Xy ra i vi catt l km v v0 = 2,615.106 m/sD. Xy ra i vi catt l km v v0 = 26,15.106 m/s 2627. Nng lng ca photon ng vi nh sng tm c = 0,41m l:A. 4,85.10-19J B. 4,85.10-25J C. 3,03ev D. Av C u ng2628.Chiu bc x in t c bc sng = 0,14 m vo catt ca t bo quang in bng ng, cng thot ca ng A=4,47eV. Cho bit: h=6,625.10-34J.s; c=3.108 m/s, e = 1,6.10-19C. Tr li cc cu hi sau:a. Gii hn quang in ca ng:A. 0,478mB. 0,406m C.0,387mD. 0,278m b. Tnh ng nng ban u cc i ca lectron quang in c bt ra khi catt.A. 7,044.10-19J.B.0,406mC.7,144.10-19J D. 7,204.10-19Jc. Phi t hiu in th hm bng bao nhiu trit tiu dng quang in trong t bo quang in.A. 4,50V B. 4,48VC. 4,40VD.4,02V2629. Chiu chm bc x c bc sng = 0,2 m vomt tm km loi, cc lectron quang in bn ra c ng nng cc i bng 5eV. Khi chiu vo tm kim loi 2 bc x c bc sng1= 1,6 m v2= 0,1 m th c hin tng quang in xy ra khng? Nu c tnh ng nng cc i ca cc lectron quang inbn ra? Cho h = 6,625.10-34J.s; c = 3.108m/s.2630. Gii hn quang in ca Natri l 0,5m th cng thot ca electron khi b mt kim loi lA. 3,97.10-19J B. 0,25.10-19J C. 4,42.10-19J D. Gi tr khc2631. Gii hn quang in ca Natri l 0,5m, chiu vo Natri nh sng c bc sng 0,25m th ng nng ban u cc i ca electron quang in lA. 0,25.10-19J B. 3,97.10-19J C. 4,42.10-19J D. Gi tr khc2632. Chiu bc x in t c bc sng vo catot ca t bo quang in th lectron quang in b bt ra c ng nng ban u cc i bng2,43.10-19J. Cho bit cng thot ca kim li lm catt l 5,52.10-19J.a. Tnh gii hn quang in ca kim loi lmcatt?b. Tnh vn tc ban u cc i ca lectron quang in v bc sng?b. Chiu ng thi 2 bc x in t c bc sng1= 0,5mv2 = 0,4m vo catt ca t bo quang in trn, phi t hiu in th hm bng bao nhiu trit tiu dng quang in? Cho h = 6,625.10 -34 J.s; c = 3.108 m/s.2633.Cng thot ca electron ca mt qu cu kim loi l 2,36eV chiu nh sng kch thch c bc sng 0,3m. Qu cu t c lp c in th cc i lA. 1,78V B. 1,5V C. 1,3V D. 1,1V2634. Ca tt ca mt t bo quang in c cng thot A=2,4(eV). Chiu vo ca tt mt chm bc x m ftn c nng lng 3,2(eV). dng quang in trit tiu phi t vo A,K mt hiu in th :A.UAK=0,8(V)B.UAK =8(V) C.UKA = 0,8(V)D.UKA=8(V)2635. Chiu mt chm nh sng n sc c bc sng 400 nm vo catt ca mt t bo quang in, c lm bng Na. Gii hn quang in ca Na l 0,50. Vn tc ban u cc i ca lectron quang in l. Chn mt p n di yA. 6,33.105 m/s; B.5,45105 m/s; C. 4,67.105 m/s;D. 3,28.105 m/s2636. Chiu mt bc x c bc sng = 0,18 m vo bn m cc ca mtt bo quang in.Kim loi dng lm m cc c gii hn quang in l 0 = 0,3 m.Cng thot ca in t bt ra khi kim loi l: A.0,6625.10-19 J.B.6,625.10-29 J. C.6,625.10-19 J. D.0,6625. 10-29 J.2637. Chiu mt bc x c bc sng = 0,18 m vo bn m cc ca mtt bo quang in.Kim loi dng lm m cc c gii hn quang in l 0 = 0,3 m.Vn tc ban u ca i ca cc quang eletronl: A.0,0985.105 m/s B. 0, 985.105 m/s.C. 9,85.105 m/s. D. 98,5.105 m/s.2638..Cng thot ca kim loi lm catt l A = 2,25 eV. Cho h = 6,625.10-34 J.s; c = 3.108 m/s.Gii hn quang in ca kim loi dng lm catt l:A.0,558.10 -6 m B.5,58.10 -6 m C.0,552.10 -6 mD. 0,552.10 -6 m.2639. Chiu vo b mt catt ca mt t bo quang in mt bc x c bc sng m 405 , 0 , ta thu c dng quang in bo ho c cng i. C th lm trit tiu dng quang in ny bng mt hiu in th hm Uh = -1,26V. Tm cng thot ca electron i vi kim loi lm cattA. 1,8V B. 8,1V C. 1,8eV D. 8,1eV2640. Chiu mt chm nh sng c tn s f = 7.108 Hz ln lt vo hai bn kim loi nhm v ka li. Gii hn quang in ca nhm 01=0,36m, ca kali02=0,55m.Hin tng g s xy ra khi chiu chm nh sng vo bn nhm v bn kali. Tnh vn tc ban u cc i cua lectron quang in khi bt ra khi bn kim loi? Cho bit: h = 6,625.1034J.s; c =3.108 m/s, me= 9,1.10-31 kg.2641. Ln lt chiu 2 bc x c tn s f1 =0,75.1015Hz v f2 = 0,5.1015 Hz vo b mt ca nti v o hiu in th hm tng ng U1 = 1,05V v U2 = 0,03V. Tnh cng thot ca na tri?Cho bit h = 6,625.10-34J.s.2642.Chiu vo b mt catt ca mt t bo quang in mt bc x c bc sng = 0,405 m,ta c mt dng quang in bo ha c cng i.C th lm trit tiu dng quang in ny bng mt hiu in th hm c ln 1,26 V. Cho h = 6,625.10-34 J.s; c = 3.108 m/s; |e| = 1,6.10-19 C. Cng thot ca electron i vi kim loi lm catt c gi tr l:A. 1,8 VB. 8,1 V C. 1,8 eVD. 8,1 eV.2643. Ln lt chiu 2 bc x c tn s f1 = 9,375.1014Hz v f2 = 5,769.1014Hz vo mt tm kim loi lm catt ca t bo quang in, ngi ta o c t s cc vn tc ban u cc i ca cc lectron quang in bng 2. Tnh cng thot ca kim loi ? Cho bit: h = 6,625.10-34J.s.2644.Mtinccphngbngnhmcchiubngnhsngtngoi cbcsng 83nm . Hi electron quang in c th ri xa mt in cc mt khong l ti a l bao nhiu. Nu bn ngoi in cc c mt in trng cn E = 7,5V/cm. bit gii hn quang in ca nhm l 0332nm A. 0,15m B. 0,51m C. 1,5.10-2m D. 5,1.10-2m2645. Khi chiu ln lt 2 bc x in t c bc sng 10, 25 m v 20, 3 m vo mt tm kim loi, ngi ta thy vn tc ban u cc i ca electron quang in ln lt l v1=7,31.105m/s, v2=4,93.105m/s. Xc nh khi lng ca electron.A.m = 0,91.10-31kg B.m = 1,9.10-31kg C.9,1.10-31kg D.1,6.10-19kg2646. Khi chiu bc x c tn s f1 = 2,2.1015Hz vo mt kim loi th c hin tng quang in v cc quang electron bn ra u b gi li bi hiu in th hm U1 = 6,6V. Cn khi chiu bc x f2 = 2,538.1015Hz vo kim loi th cc quang electron bn ra u b gi li bi hiu in th hm U2 = 8V. Xc nh hng s PlankA.6,627.10-34Js B.6,625.10-34Js C.6,265.10-34Js D.6,526.10-34Js2647. Chiu mt chm bc x n sc vo catt ca t bo quang in trit tiu dng quang in th hiu in th hm c gi tr tuyt i l 1,9V. Vn tc ban u cc i ca quang electron l bao nhiu?A. 5,2.105m/s;B. 6,2.105m/s;C. 7,2.105m/s;D. 8,2.105m/s2648. Chiu mt chm nh sng n sc c bc sng 400nm vo catt ca mt t bo quang in, c lm bng Na. Gii hn quang in ca Na l 0,50 m. Vn tc ban u cc i ca electron quang in lA. 3.28.105m/s;B. 4,67.105m/s;C. 5,45.105m/s;D. 6,33.105m/s2649. Chiu vo catt ca mt t bo quang in mt chm bc x n sc c bc sng 0,330 m. trit tiu dng quang in cn mt hiu in th hm c gi tr tuyt i l 1,38V. Cng thot ca kim loi dng lm catt lA. 1,16eV;B. 1,94eV;C. 2,38eV;D. 2,72eV2650. Chiu mt chm bc x n sc vo catt ca t bo quang in trit tiu dng quang in th hiu in th hm c gi tr tuyt i l 1,9V. Vn tc ban u cc i ca quang electron l bao nhiu?A. 5,2.105m/s;B. 6,2.105m/s;C. 7,2.105m/s;D. 8,2.105m/s2651. Khi chiu mt chm sng n sc vo mt kim loi c hin tng quang in xy ra. Nu dng mt hiu in th hm bng 3,0 V th cc quang electron khng ti ant c. Cho bit tn s gii hn ca kim loi l ( ) C e s J h s f19 34 1 14010 . 6 , 1 , . 10 . 625 , 6 , 10 . 6 . Tn s ca chm nh sng ti s lA. 1,5.1014 HZ; B. 1,25.1014 HZ; C. 13,25.1014 HZ;D. 25.1014 HZ;2652. Khi chiu mt bc x in t n sc bc sng =0,41m vo catt ca mt t bo quang in thc hintngquanginxyra.trittiudngquanginngitatmthiuinth ngc l 0,76V. Cho 34 8 -19h 6, 625.10 Js,c=3.10 m/ s,1eV=1,6.10 J . Cng thot ca electron i vi kim loi dng lm catt s l A. 36,32.10-20 J B. 3,3125.10-20J C. 0,3125.10-20J D. 33,25.10-20J2653. Kim loi dng lm ca tt ca mt t bo quang in c cng thot A=2,2eV. Chiu vo ca tt mt bc x in t c bc sng. Bit Uh=0,4V, vn tc ban u cc i ca e l bao nhiu?A. 3,75.105m/s; B. 3,5.105m/s; C. 3,75.104m/s; D. 3,5.104m/s.2654. Chiu mt chm bc x n sc c bc sng 0,276 m vo catt ca mt t bo quang in th hiu in hm c gi tr tuyt i bng 2V. Cng thot ca kim loi dng lm catt lA. 2,5eV;B. 2,0eV;C. 1,5eV;D. 0,5eV2655. Chiu mt chm bc x n sc c bc sng 0,5 m vo catt ca mt t bo quang in c gii hn quang in l 0,66 m. Vn tc ban u cc i ca electron quang in lA. 2,5.105m/s;B. 3,7.105m/s;C. 4,6.105m/s;D. 5,2.105m/s2656. Chiu mt chm bc x n sc c bc sng 0,5 m vo catt ca mt t bo quang in c gii hn quang in l 0,66 m. Hiu in th cn t gia ant v catt trit tiu dng quang in lA. 0,2V;B. - 0,2V;C. 0,6V;D. - 0,6V2657. Cong thoat electron ra khoi kim loai A = 6,625.10-19J, hang so Plang h = 6,625.10-34Js, van toc anh sang trong chan khong c = 3.108m/s. Gii han quang ien cua kim loai o laA. 0,300 m. B. 0,295 m. C. 0,375 m. D. 0,250 m.2658. Chiu mt chm bc x n scvo catot ca t bo quang in, trit tiu dng quang inth hiu in th hmUh = -1,9 V . Vn tc ban u cc i ca quang electron l :A. 5,2.105 m/s. B. 6,2.105 m/s.C. 7,2.105 m/s.D. 8,2.105 m/s.2659. Chiu chm bc x c bc sng 0,18 m vo catt ca mt t bo quang in lm bng kim loi c gii hn quang in l 0,3 m. Tm vn tc ban u cc i ca cc quang electron.A. 0,0985.105m/s. B. 0,985.105m/s. C. 9.85.105m/s. D. 98,5.105m/s.2660. Chiu chm bc x c bc sng 0,18 m vo catt ca mt t bo quang in lm bng kim loi c gii hn quang in l 0,3 m. in p hm lm trit tiu dng quang in lA. 2,76V. B. 27,6V. C. 2,76V. D. 0,276V.2661. Gii han quang ien cua kem la 0,36 m,cong thoat cua kem ln hn cua Natrila 1,4 lan.Giihan quang ien cua Natri laA.0,504 mB.0,504 mm C.0,504 mD.5,04 m2662. Chiu chm bc x c bc sng 0,4 m vo catt ca mt t bo quang in lm bng kim loi c cng thot electron l 2eV. in p hm trit tiu dng quang in lA. -1,1V. B. -11V. C. 1,1V. D. 0,11V.2663. Cng thot electron khi ng l 4,57eV. Chiu chm bc x in t c bc sng vo mt qu cu bng ng t xa cc vt khc th qu cu t c in th cc i 3V. Bc sng ca chm bc x in t lA. 1,32 m. B. 0,132 m. C. 2,64 m. D. 0,164 m.2664. Khi chiu mt chm bc x c bc sng = 0,33 m vo catt ca mt t bo quang in th in p hm l Uh. c in p hm Uh vi gi tr |Uh| gim 1V so vi |Uh| th phi dng bc xa c bc sng bng bao nhiu?A. 0,225 m. B. 0,325 m. C. 0,425. D. 0,449 m.2665. Cng thot electron khi ng l 4,57eV. Khi chiu bc x c bc sng = 0,14 m vo mt qu cu bng ng t xa cc vt khc th qu cu c tch in n in th cc i lA. 0,43 V. B. 4,3V. C. 0,215V. D. 2,15V.2666. Chiu bc x t ngoi c = 0,25 m vo mt tm kim loi c cng thot 3,45 eV. Vn tc ban u cc ica lectron quang in l:A. 7,3.105 m/s. B. 7,3.10-6 m/s.C. 73.106 m/s. D. 6.105 m/s.2667. Gii hn quang in ca canxi l 0 = 0,45 m th cng thot electron ra khi b mt canxi l :A. 5,51.10-19JB. 3,12.10-19J C. 4,41.10-19J D. 4,5.10-19J2668. Nng lng photon ca tia Rnghen c bc sng 0,05 l :A. 39,72.10-15JB.49,7.10-15J C. 42.10-15J D. 45,67.10-15J2669 Mt t bo quang in c catt bng Na , cng thot electron ca Na bng 2,1 eV . Gii hn quang in ca Na l :A. 0,49 mB. 0,55 m C. 0,59 mD. 0,65 m2670 Mt t bo quang in c catt bng Na , cng thot electron ca Na bng 2,1 eV . Chiu vo catt bc x c bc sng 0,42 m . Hiu in th hm c tr s l :A. 0,85V B. 0,2V C. 0,4VD. 0,25V2671.. Catt ca t bo quang in c gii hn quang in l 0,66m . Khi chiu vo catt bc x c bc sng th ng nng ban u cc i ca electron quang in b bc ra khi cattl 3.10-19J . c gi tr l A. 0,33 mB. 0,033 m C. 0,55 m D.0,5 m2672. Chiu bc x in t c bc sng = 0,33 m ln mt tm kim loi dng lm Katt ca t bo quang in c gii hn quang in 0= 0,66m hiu in th ga Ant v Katt l UAK=1,5V. ng nng cc i ca quang electron khi p vo Ant l :A. 5,41.10-19JB. 5,35.10-19JC. 6,42.10-19JD. 7,47.10-19J2673. Cng thot ca electron ra khi ng l 4,47 eV. Khi chiu bc x in t c bc sng = 0,14 m vo qu cu bng dng t xa cc vt khc th qu cu c tch in n in th cc i l: (h = 6,625.10-34 Js; c = 3.108 m/s; e = - 1,6.10-19C; me= 9,1.10-31kg)A.2,4V. B.4V.C. 4,4V. D. 6,4V.2674 Cong thoat electron khoi ong la 4,57eV. Chieu chum bc xa ien t co bc song vao mot qua cau bang ong at xa cac vat khac th qua cau at c ien the cc ai 3V. Bc song cua chum bc xa ien t o laA. 1,32 m. B. 0,132 m. C. 2,64 m. D. 0,164 m.2675.Chieu chum bc xa co bc song 0,18 m vao catot cua mot te bao quangien lam bang kim loaicogii han quang ien la 0,3 m. Tm van toc ban au cac ai cua cac quang electron.A. 0,0985.105m/s. B. 0,985.105m/s. C. 9.85.105m/s. D. 98,5.105m/s.2676.Chieu chum bc xa co bc song 0,18 m vao catot cua mot te bao quang ien lam bang kim loai co gii han quang ien la 0,3 m. Hieu ien the ham e lam triet tieu dong quang ien laA. 2,76V. B. 27,6V. C. 2,76V.D. 0,276V.2677. Trong hien tng quang ien,so electron en c anottrong 10 s la 3.1016.Cng o dong quang ien laA.0,48 A. B.4,8 A. C.0,48 mA. D.4,8 A.2678.Chieuchumbcxa cobcsong0,4 mvaocatotcuamotte bao quang ien lam bang kim loai co cong thoat electron la 2eV. Hieu ien the ham e triet tieu dong quang ien laA. -1,1V. B. -11V. C. 1,1V. D. 0,11V.2679. Cho khi lng lectron lag m = 9,1.10-31 kg, in tch lectron e = 1,6.10-19 C. Vn tc ban u cc i ca cc lectron quang in bng bao nhiu? Bit hiu in th hm bng 45,5 V.A. 3,2.106 m/s. B. 1,444.106m/s. C. 4.106m/s. D. 1,6.10-6m/s.2680. Nng lng ca phtn l 2,8.10-19J. Cho hng s Plng h = 6,625.10-34Js, vn tc ca nh sng trong chn khng c = 3.108 m/s. Bc sng ca nh sng lA. 0,71 m. B. 0,66 m. C. 0,45 m. D. 0,58 m.2681. Cng thot i vi Csi l A = 1eV. Cho khi lng lectron l m = 9,1.10-31 kg, in tch lectron l e = 1,6.10-19C; hng s Plng l h = 6,625.10-34Js, vn tc nh sng trong chn khng c = 3.108m/s. Vn tc ban u cc i ca cc lectron quang in khi chiu vo csi nh sng c bc sng 0,5 m lA. 7,3.105m/s. B. 4.106m/s. C. 5.105m/s. D. 6,25.105m/s.Chuyn 59:Chuyn ng ca electron trong in trng u v t tr-ng u: Tnh vn tc ca e khi n c tng tc bi in p U, tnh bn knh qu o trn ca electron trong t trngu.A. Tm tt l thuyt v cng thc:- in p U tng tc cho electron: 221v m eUe2021v me(0v v v ln lt l vn tc u v vn tc sau khi tng tc ca e).- Trong in trng u:dF e E r r ln: E e F- Trong t trng u: B qua trng lc ta ch xt lc Lorenx:

sin vB e f ( ) B v , Nu vn tc ban u vung gc vi cm ng t: lectron chuyn ng trn u vi bn knh

. m vRe B; bn knh cc i: B emvRmax 0maxNu vn tc ban u xin gc vi cm ng t: lectron chuyn ng theo vng xon c vi bn knh vng c: sinmax 0B emvR B. Bi tp c hng dn:V d1:Chiu bc x in t vo catt ca t bo quang in to ta dng quang in bo ha. Ngi ta c th trit tiu dng quang in bo ha ny bng in p hm V Uh3 , 1 . Dng mn chn tch ra mt chm hp cc electron quang in v cho n i qua mt t trng u c cm ng tT B510 . 6theo phng vung gc vi B.a. Tnh vn tc ban u cc i ca cc quang electron.b. Tnh lc tc dng ln electron.c. Bn knh qu o ca electron trong t trng.Hng dn gii:a. Ta c:heU mv 2max 021

( )s mmeUvh/ 10 . 76 , 610 . 1 , 93 , 1 ). 10 . 6 , 1 .( 2 253119max 0 b. Lc tc dng ln electron chnh l lc Lo-ren-x, tnh bi biu thc : sin vB e f Trong l gc hp bi max ov v B, y 090 .Vy : N vB e f18 5 5 1910 . 5 , 6 10 . 6 . 10 . 76 , 6 . 10 . 6 , 1 c. Bn knh ca electron :cm mB emvR 4 , 6 064 , 0max 0 .C. Cu hi v bi tp t luyn tp:2682. Catot ca mt t bo quang ph c ph mt lp Cxi, c cng thot l 1,9eV. Catot c chiu sng bi mt chmnhsngnsccbcsng0, 56 m . Dngmuchntchramt chmhpcc electron quang in v hng n vo mt t trng u c Bur vung gc vi ax mvuuur ca electron v B = 6,1.10-5 T. Xc nh bn knh ca qu o cc electron i trong t trng.A.0.36cm B.0,63cm C.3,16cm D.6,03cm2683. Chieu bc xa n sac bc song =0,533(m) vao mot tam kim loai co cong thoat electron A=3.1019J .Dung man chan tach ra mot chum hep electron quang ien va cho chung bay vao mot mien t trng eu co cam ng t Bur. Hng chuyen ong cua electron quang ien vuong goc vi Bur. Biet ban knh cc ai cua quy ao cac electron la R = 22,75mm .Tm o ln cam ng t B cua t trng.A. B = 2.104(T) B. B = 104(T)C. B = 1,2.104(T) D. B = 0,92.104(T)2684. Dng mn chn tch ra mt chm hp cc electron quang in v hng n vo mt t trng u c vc t cm ng t Bvung gc vi vect vn tc ca cc electron quang in. T trng c cm ng t B=9,1.10-5T , ng knh cc i ca qu o cc electron quang in l 4,0cm. Vn tc cc i ca cc electron quang in l:A. 6,4.105m/s. B. 3,2.103m/s.C. 3,2.105m/s.D. 6,4.103m/s. bi ny dng tr li cho cc cu2685, 2686, 2687:Khi chiu mt bc x in t vo b mt catt ca mt t bo quang in, to ra dng quang in bo ha. Ngi ta c th lm trit tiu dng in ny bng mt hiu in th hm c gi tr 1,3V. Dng mn chn tch ra mt chmhp cc electron quang in v cho i vo mt t trng u c B=6.10-5T. Cho 19 311, 6.10 ; 9,1.10ee C m kg 2685. Cho vn tc cc i m vr ca quang electron.A.0,68.105 m/s B.0,68.106 m/s C.0,86.105 m/s D.0,86.106 m/s2686. Tnh lc tc dng ln electron:A. 6,528.10-17N B. 6,528.10-18N C. 5,628.10-17N D. 5,628.10-18N 2687. Tnh bn knh qu o ca electron chuyn ng trong t trng:A. 0,64m B. 0,064m C. 0,046m D. 0,46mChuyn 60: Tnh dng quang in bo ha (s e n anot trong mt n v thi gian), cng sut ngun sng (s photon pht ra trong mt n v thi gian), hiu sut lng tA. Tm tt l thuyt v cng thc:1. Cng sut ca ngun sng.

. P n IS e HIhcP Pnbh

n l s photon ca ngun sng pht ra trong mi giy; llng t nng lng (photon); ( Il cng ca chm sng, H l hiu sut lng t)2. Cng dng in bo ha. e Hn e ntqIe bh tNeInbhe Nl s electron n c Ant trong thi gian t giyen l s lectron n Ant trong mi giy.e l in tch nguyn t 191, 6.10 e C3. Hiu sut lng t.

e PhcIe PInnHbh bh '' nl s lectron bt ra khi Katt kim loi trong mi giy.n l s photon p vo Katt trong mi giy.- Gi P l cng sut ca ngun sng pht ra bc x ng hng, d l ng knh ca con ngi. nhy ca mt l n photon lt vo mt trong 1(s). Khong cch xa nht m mt cn trng thy ngun sng bng: nhcP dnP dD 4 4max Ch : Khi dng quang in bo ho th n = neB. Bi tp c hng dn:V d 1:Chiu bc x c bc sng m 405 , 0 vo catot ca t bo quang in th dng quang in bo ha l mA Ibh98 , dng in ny c th b trit tiu bi in p V Uh26 , 1 .a. Tm cng thot ca kim loi lm catot v max 0vb. Gi s hiu sut lng t l 50%. Tnh cng sut ca ngun sng chiu vo catot (coi ton b cng sut ca ngun sng chiu vo catot).Hng dn gii:a. Ta c:heU Ahc+ ( )( ) eV J eUhcAh8 , 1 10 . 88 , 2 26 , 1 10 . 6 , 110 . 405 , 010 . 3 . 10 . 625 , 619 1968 34 Li c:heU mv 2max 021( ) ( )s mmeUvh/ 10 . 6 , 610 . 1 , 926 , 1 . 10 . 6 , 1 . 2 253119max 0 b. S electron n c catot l:eInbhe Hiu sut lng t l: nnnnHe 'Hnne (dng quang in bo ha nn en n ')Suy ra:H eInbhCng sut ca ngun sng:hcH eIn Pbh. Thay s:W P 6 , 010 . 405 , 010 . 3 . 10 . 625 , 6.5 , 0 . 10 . 6 , 1. 10 . 9868 34193 V d 2: Catt ca mt t bo quang in c cng thot l 2,26eV. B mt catt c chiu bi bc x c bc sng 0,4 m.a. Tnh tn s ca gii hn quang in.b. B mt catt nhn c mt cng sut chiu sng l 3mW. Tnh s phtn m b mt catt nhn c trong 30s.c. Cho hiu sut quang in bng 67%. Tnh s lectron quang in bt ra trong mi giy v cng dng quang in bo ha.Hng dn gii:a. 1534190010 . 5458 , 010 . 625 , 610 . 6 , 1 . 26 , 2hA cf Hz.b. Gi nl s phtn chiu n t bo quang in trong 1s.Cng sut bc x:158 346 310 . 04 , 610 . 3 . 10 . 625 , 610 . 4 , 0 . 10 . 3 hcPnhc nn PS phtn m b mt catt nhn c trong 30s: N=30n =181,2.1015c. Gi' nl s lectron b bt ra trong 1s: ' n 67%n = 4,0468.1015.Cng dng quang in bo ha: e n e n Ie bh'4,0468.1015.1,6.10-19 =0,6475mA.V d 3(*): Ngun sng c cng sut W P 2 , pht ra bc x c bc sng m 597 , 0 ta theo mi hng. Tnh xem khong cch bao xa ngi ta cn c th trng thy c ngun sng ny, bit rng mt cn thy ngun sng khi c t nht80 nphoton lt vo mt trong 1 giy. Bit con ngi c ng knh mm d 4 . B qua s hp th photon ca mi trng.Hng dn gii:S photon ca ngun sng pht ra trong 1 giy:hcP Pn Gi D l khong cch t mt n ngun sng, th s photon trn c phn b u trn mt hnh cu c bn knh l D.S photon qua 1 n v din tch ca hnh cu trong 1 giy l:2 24 . 4 D hcPDnk S photon lt vo con ngi trong 1 giy l: 22222. 16 4 ..4.2 D hcd PD hcP dkdN ,_

mt cn nhn thy c ngun sng th80 n N (n l nhy ca mt s photont nht lt vo mt m mt cn pht hin ra). Suy ra: nD hcd P22. 16 mnhcP dD38 346 310 . 37410 . 3 . 10 . 625 , 6 . 8010 . 597 , 0 . 2410 . 4` 4 C. Cu hi v bi tp t luyn tp:2688. Cng dngquang in bo ho trong mch l 0,32mA. Tnh s photon p vo Catot ca t bo quang in trong thi gian t = 20s, bit rng ch c 80% lectron tch ra c chuyn v ant . Cho e=1,6.10-19C.A. 5.1016. B. 3.1018. C. 2,5.1016. D. 3.1020.2689. Cng dng quang in bo ho gia catt v ant trong t bo quang in l A 16. Cho in tch ca electronC e1910 . 6 , 1 . S electron n c ant trong mt giy l:A. 1020B. 1016C. 1014 D. 1013 bi ny dng tr li cc cu 2690, 2691:Bit trong 10s, s electron n c anod ca t bo quang in 163.10v hiu sut lng t l 40%2690. Tm cng dng quang in lc nyA.0,48A B.4,8A C.0,48mA D.4,8mA2691. Tm s photon p vo catod trong 1 phtA.45.1016 photon/giy B.4,5.1016 photon/giyC.45.1016 photon/pht D.164, 5.10 photon/pht bi ny dng tr li cc cu 2692, 2693, 2694:Mt ngun pht sng n sc c bc sng 0, 45 m chiu vo catod ca mt t bo quang in. Cng thot ca kim loi lm catod l A = 2,25eV. Cho h = 346, 625.10Js; c = 83.10 m/s; m = 319,1.10kg; e = 191, 6.10C2692. Tnh gii hn quang in ca kim loi dng lm catodA.60, 558.10m B.65, 58.10m C.60, 552.10m D.60, 552.10 m2693. Tnh vn tc cc i ca cc electron quang in b bt ra khi catodA.50, 421.10 m/s B. 4,23.105m/s C.542,1.10 m/s D.5421.10 m/s2694. B mt catod nhn c cng sut chiu sng P = 5mW. Cng dng quang in bo ha ca t bo quang in Ibh = 1mA. Tnh hiu sut quang inA.35,5% B.48,3% C.55,21% D.53,5%2695. Nng lng cc i ca cc electron b bc ra khi mt kim loi di tc dng ca nh sng c bc sng 0, 3 m l 1,2eV. Cng nh sng l 3W/m2. Tnh cng thot v s electron pht ra trn mt n v din tch trong n v thi gian, bit hiu sut l 5%A. ( )'s m p h o t o nV2 1 8/ 1 0 . 6 5 , 2 29 , 2B. ( )'s m p h o t o nV2 1 8/ 1 0 . 2 6 5 , 22 , 9C. ( )'s m p h o t o ne V2 1 8/ 1 0 . 2 2 6 5 , 09 , 2D. ( )'s m p h o t o ne V2 1 8/ 1 0 . 0 2 2 6 5 , 02 , 2 92696. Mt n pht nh sng n sc c bc sng 60, 4.10 m c dng chiu vo mt t bo quang in. B mt ca catt nhn c mt cng sut chiu sng P = 3mW; cng dng quang in bo hoax ca t bo quang in i = 66, 43.10 A. Tnh t s 'nn (vi n: s photon m catt nhn c trong mi giy; n: s electron b bt ra trong mi giy). Cho h = 346, 625.10Js; c = 83.10 m/s.A.0,15025 B.150,25 C.510,25 D.51,0252697.Cng sut ca ngun sng c bc sng 0,3 m l 2,5W, hiu sut lng t 100%, cng dng quang in bo ho lA. 0,6A B. 0,6mA C. 60mA D. 6m 2698. Catot ca t bo quang in c cng thot A=2,1(eV). Chiu vo catot mt chm nh sang c bc sng vi cng sut 2 (W) th hiu sut lng t l:A. cha iu kin tnh B. H=0,2C. H=0 D. H=0,0982699. Trong hin tng quang in m dng quang in t gi tr bo ha,s electron n c anttrong 10 s l 3.1016 v hiu sut lng t l 40%.S photon p vo catt trong 1 pht l:A.45.1018 photon/pht. B.4,5.1018 photon/pht.C.45.1016 photon/pht. D.4,5.1016 photon/pht2700.Mt ngunphtnhsngnsccbcsng =0,45 mchiuvocatt catboquang in.Cng thot ca kim loi lm catt l A = 2,25 eV.B mt catt nhn c cng sut chiu sng P = 5 mW.Cng dng quang in bo ha l Ibh = 1 mA.Cho h = 6,625.10-34 J.s; c = 3.108 m/s; m = 9,1.10-31 kg; |e| = 1,6.10-19 C.Khi hiu sut quang in l:A.35,5%B.48,3% C.55,3%D.53,5% 2701.Chiu nh sng c bc sng 0, 35 m vo kim loi c cng thot 2,48eV ca mt t bo quang in. Bit cn nh sng l 3W/m2. tnh hiu sut lng t v cng dng quang in bo hoax l i = 0.02AA. 2,358% B. 3,258% C. 5,328% D. 2,538%2702. Chiu bc x c bc sng=0,552m vo ca tt ca mt t bo quang in dng quang in bo ha c cng l Ibh=2mA. Cng sut ngun sng chiu vo ca tt l P=1,2 (W). Tnh hiu sut lng t ca hin tng quang in.A. 0,650%B. 0,3750% C. 0,550% D. 0,4250%.2703. Trong 10s, s electron n c ant ca t bo quang in l 3.1016. Cng dng quang in lc lA. 0,48A. B. 4,8A. C. 0,48mA. D. 4,8mA.2704. Kim loi dng lm catt ca t bo quang in c cng thot electron l 1,8eV. Chiu vo catt mt nh sng c bc sng = 600nm t mt nguon sng c cng sut 2mW. Tnh cng dng quang in bo ho. Bitc 1000ht phtn ti p vo catt th c 2 electron bt ra.A. 1,93.10-6A. B. 0,193.10-6A. C. 19,3mA. D. 1,93mA.2705. Chiu chm nh sng c cng sut 3W, bc sng 0,35 m vo catt ca t bo quang in c cng thot electron 2,48eV th o c cng dng quang in bo ho l 0,02A. Tnh hiu sut lng t.A. 0,2366%. B. 2,366%. C. 3,258%. D. 2,538%.2706. Mt t bo quang ien c catt c lm bng asen c cng thot electron bng 5,15eV. Chiu vo catt chm bc x in t c bc sng 0,2 m v ni t bo quang in vi ngun in mt chiu. Mi giy catt nhn c nng lng ca chm sng l 3mJ, th cng dng quang in bo ho l4,5.10-6A. Hiu sut lng t lA. 9,4%. B. 0,094%. C. 0,94%. D. 0,186%.2707. Mt n laze c cng sut pht sng 1W pht nh sng n sc c bc sng 0,7 m. Cho h = 6,625.10-34 Js, c = 3.108m/s. S phtn ca n pht ra trong 1 giy l:A. 3,52.1019. B. 3,52.1020. C. 3,52.1018. D. 3,52.1016.2708. Gi s cc electron thot ra khi catt ca t bo quang in u b ht v ant, khi dng quang in c cng I = 0,32mA. S electron thot ra khi catt trong mi giy l : A. 2.1015 B. 2.1017 C. 2.1019 D. 2.1013 bi ny dng tr li cc cu 2709, 2710:Chiu mt bc x in t c bc sng = 0,546 m ln mt tm kim loi dng lm Katt ca t bo quang in, thu c dng in bo ho c cng Io=2mA. Cng sut bc x in t l P = 1,515 W.2709. Hiu su lng t ca hiu ng quang in l:A. 30,03.10-4 B. 42,25.10-4C. 51,56.10-4 D. 62,25.10-42710. Gi s cc electron c tch ra bng mn chn ly mt chm hp hng vo mt t trng u c cm ng t B = 10-4T, sao cho Brvung gc vi phng ban u ca vn tc electron. Bit qu o ca cc electron c bn knh cc i l R = 23,32mm. Vn tc ban u cc i ca cc electron quang in l:A.1,25.105m/s.B. 2,36.105m/s.C. 3,6.105m/s D. 4,1.105m/s2711. Mt n Na chiu sng c cng sut pht x P=100W. Bc sng ca nh sng do n pht ra l 0,589m s photon do n ng pht ra trong 30 giy l bao nhiu?A. 9.1021 B. 9.1018 C. 12.1022 D. 6.10242712. Chieu mot bc xa ien t co bc song =0,546m len mat kim loai dung catot cua mot te bao quang ien, thu c dong bao hoa co cng o I0 = 2mA. Cong suat cua bc xa ien t la P 1,515W.a. Tm hieu suat lng t cua hieu ng quang ien.A. 30,03.10-4B. 42,25.10-4C. 51,56.10-4D. 62,25.10-4b. Gia s cac electron o c tach ra bang man chan e lay mot chum hep hng vao mot t trng eu co cam ng t B=104 T,sao cho Bur vuong goc vi phng ban au cua van toc electron. Biet quy ao cua cac electron co ban knh cc ai la R = 23,32mm . Xac nh van toc ban au cc ai cua cac electron quang ien.A. 1,25.105m/s B. 2,36.105m/s C. 3,5.105m/s D. 4,1.105m/s2713. Mt ngn n pht ra nh sng n sc c bc sng 0,6 m. s pht ra bao nhiu phtn trong 1s, nu cng sut pht x ca n l 10 W ?A. 1,2.1019 ht/s. B. 6. 1019 ht/s. C. 4.5. 1019 ht/s.. D. 3. 1019 ht/s.2714. Mt n Na chiu nh sng c cng sut pht x P = 100 W. Bc sng ca nh sng vng do n pht ra l 0,589 m. Hi trong 30s, n pht ra bao nhiu phtn ? Cho hng s Plng l h = 6,625.10-34Js, vn tc nh sng trong chn khng c = 3.108m/s.A. 6.1024. B. 9.1018. C. 9.1021. D. 12.1022.Chuyn 61:Tnh tn s, chu k, bc sng, nng lng photon do ng rnghen pht raA. Tm tt l thuyt v cng thc:- Gi nng lng ca 1 electron trong chm tia Catot c c khi n i m cc l W, khi chm ny p vo i m cc n s chia lm 2 phn: Nhit lng ta ra (Qi) lm nng i m cc v phn cn li c gii phng di dng nng lng photon ca tia X (bc x Rn-ghen).

+ i Q WTrong : ch hf (l nng lng photon ca tia Rnghen) 2 2202mvU emvW+ l ng nng ca electron khi p vo i catt (i m cc) U l hiu in th gia ant v catt v l vn tc electron khi p vo i catt v0 l vn tc ca electron khi ri catt (thng v0 = 0) m = 9,1.10-31 kg l khi lng electronGi n l s e p vo i Catot trong 1 (s).- Cng dng in qua ng Rn-ghen: e n I Trng hp b qua nhit lng ta ra trn i m cc:Ta c: Wngha l Wch Hay Whc - ng Rn Ghen s pht bc x c bc sng nh nht nu ton b nng lng ca chm tia Katot chuyn hon ton thnh nng lng ca bc x Rn Ghen. Bc sng nh nht c tnh bng biu thc trn khi du = xy ra : WhcminTrng hp ton b nng lng ca electron bin thnh nhit lng: - Nhit lng ta ra trn i Catot trong thi gian t:nt W Q Trng hp tng qut:- Hiu sut ca ng Rnghen: i WQ WWH B. Bi tp c hng dn:V d 1: Bit hiu in th gia A v K ca ng tia Rnghen l 12kV. Tm bc sng nh nht ca tia Rn-ghen do ng pht ra. T suy ra tn s ln nht ca bc x do ng Rn-ghen pht ra.Hng dn gii:ng nng ca lectron (mt phn hay ton b) bin thnh nng lng ca tia X 2max2oAKAKmv hc hceUeU Bc sng nh nht ca tia X do ng pht ra:meUhcAK10198 34min10 . 035 , 112000 . 10 . 6 , 110 . 3 . 10 . 625 , 6 Suy ra: Hzcf18108minmax10 . 9 , 210 . 035 , 110 . 3 V d 2: Mt ng Rnghen pht ra bc x c bc sng nh nht l 3.10-10m. Bit c = 3.108 m/s; h = 6,625.10-34 Js. ng nng ca lectron khi p vo i m cc l bao nhiu?Hng dn gii:ng nng ca lectron khi p vo i m cc c th mt phn hoc ton b chuyn thnh nng lng ca tia X:hcmv2120;du = xy ra vi nhng bc x c bc sng nh nht, do 16108 34min2010 . 625 , 610 . 310 . 3 . 10 . 625 , 6 hcmv21 JV d 3: Chm tia Rn-ghen m ngi ta thy c nhng tia c tn s ln nht v bngHz1910 . 5 .a. Tnh ng nng cc i ca electron p vo i catt?b. Tnh in p hai u ng Rn-ghen? Bit vn tc ca electron khi ri Catt bng khng.c. Trong 20s ngi ta xc nh c 1018 electron p vo i catt. Tnh cng dng in qua ng Rn-ghen?Hng dn gii:a. Tn s ln nht ng vi ton b nng lng ca electron khi n i catt chuyn ha nng nng lng ca photon tia Rn-ghen:J hf W14 19 34max max10 . 3125 , 3 10 . 5 . 10 . 625 , 6 b. in p hai u ng Rn-ghen:VeWU U e W5 maxmax10 . 07 , 2 c. Cng dng in: mA eNi 8 10 . 6 , 1 .2010.201918 V d 4 (*): Mt ng Rn-ghen hot ng di in p V U 50000 . Khi cng dng in qua ng Rn-ghen lmA I 5 . Gi thit 1% nng lng ca chum electron c chuyn ha thnh nng lng ca tia X v nng lng trung bnh ca cc tia X sinh ra bng 75% nng lng ca tia c bc sng ngn nht. Bit electron pht ra khi catot vi vn tc bng 0.a. Tnh cng sut ca dng in qua ng Rn-ghenb. Tnh s photon ca tia X pht ra trong 1 giy?c. Catot c lm ngui bng dng nc c nhit ban uC t0110 . Hy tm lu lng nc (lt/pht) phi dung gi cho nhit catot khng thay i. Bit khi ra khi ng Rn-ghen th nhit ca nc l C t0225 . Nhit dung ring ca nc l K kgJc.4200 . Khi lng ring ca nc l 1000kg/m3.Hng dn gii:a. Cng sut ca dng in qua ng Rn-ghen (chnh l nng lng m chm electron mang n catot trong 1 giy): W UI P 250 10 . 5 . 500003 b. Nng lng ca chm tia Rn-ghen sinh ra trong 1 giy:UI W . 01 , 0 Kh electron chuyn ng n catot v bc x ra tia Rn-ghen c bc sng ngn nht s c nng lng ln nht: U e W max(ton b nng lng ca do electron em ti u chuyn ha thnh nng lng ca tia X) Nng lng trung bnh ca cc tia X:U e W 75 , 0 S photon do tia X sinh ra trong 1 giy:1410 . 2 , 475 75 , 0. 01 , 0 eIU eUIWWN (photon/s)c. Phn nng lng bin thnh nhit trong 1 giy:UI Q . 99 , 0 Nhit catot khng i nn phn nhit lng sinh ra ny s b nc hp th ht v em i, do vy: t mc UI Q . 99 , 0 t cUIm. 99 , 0 (m l khi lng nc i qua trong 1 giy) s kg m / 10 . 39 , 015 . 420010 . 5 . 50000 . 99 , 023

23 , 0 / 23 , 0601. 10 . 39 , 02 pht kgskgm(lt/pht)C. Cu hi v bi tpt luyn tp:2715. Hiu in th gia ant v katt ca ng Rnghen l 15KV. Bc sng nh nht ca tia Rnghen lA. 0,83.10-8m B. 0,83.10-9m C. 0,83.10-10m D. 0,83.10-11m2716. trong mt ng Rghen ngi ta to ra mt hiu in th khng i gia hai cc. trong mt pht ngi ta m c 6.1018 in t p vo catt. tnh cng dng in qua ng RghenA. 16mA B. 1,6A C. 1,6mA D. 16A2717.ng tia X lm vic hiu in th U = 50KV v cng d dng in I = 2mA, trong1s bc x n = 5.1013 phtn. Bit bc sng trung bnh ca tia X l = 0,1nm. Cho bit c = 3.108 m/s, h = 6,625.10-34J.s. Tr li cc cu hi sau:a. Tnh cng sut ca dng in s dng:A. 300W.B. 400W .C. 500W.D. 530WE. 100 Wb. Hiu sut ca ng tia X:A. 0,1%.B.1%.C.10%. D.19%2718. Trong mt giy c 1015eletron t catt n p vo ant. Dng in bo ho lA. 1,6A B. 0,16mA C. 0,16A D. Gi tr khc2719.Hiu in th gia ant v catt ca ng Rnghen l 3.104(V). Cho in tch electron C e1910 . 6 , 1 ; hng s planks J h . 10 . 625 , 634 , vn tc ca nh sng trong chn khngs m c / 10 . 38 . Bc sng nh nht ca chm tia Rnghen pht raChn mt p n di yA. m1110 . 14 , 4 B. m1110 . 14 , 3 C. m1110 . 6 , 1D. m1110 . 25 , 2 bi ny dng tr li cho cc cu2720, 2721, 2722:Trong mt ng Rghen, s electron p vo catt trong mt giy l n = 5.1015 ht, vn t mi ht l 8.107m/s2720. Tnh cng dng in qua ng:A. 8.10-4A B. 0,8.10-4A C. 3,12.1024A D. 0,32.10-4A2721. Tnh hiu in th gia ant v catt bit vn tc ca electron khi ri Catt bng 0A. 18,2V B. 18,2kV C. 81,2kV D. 2,18kV2722. Tnh bc sng nh nht trong chm tia Rghen do ng pht ra:A. 0,68.10-9m B. 0,86.10-9m C. 0,068.10-9m D. 0,086.10-9m2723.Trong mt ng Rghen, bit hiu in th gia ant v catt l U = 2.106V. Hy tnh bc sng nh nht min ca tia Rghen do ng pht ra:A. 0,62mm B. 0,62.10-6m C. 0,62.10-9m D. 0,62.10-12m bi ny dng tr li cho cc cu2724, 2725, 2726:Chmtia Rghen pht ra tng Rghen, ngi ta thy c nhng tia c tn s ln nht v bng ) ( 10 . 519maxHz f 2724. Tnh ng nng cc i ca electron p vo i catt:A. 3,3125.10-15J B. 33,125.10-15J C. 3,3125.10-16J D. 33,125.10-16J2725. Tnh hiu in th gia hai cc ca ng:A. 20,7kV B. 207kV C. 2,07kV D. 0,207kV2726. Trong 20s ngi ta xc nh c 1018 electron p vo i catt. Tnh cng dng in qua ng:A. 0,8A B. 0,08A C. 0,008A D. 0,0008A bi ny dng tr li cho cc cu2727, 2728, 2729, 2730:Mt ng pht ra tia Rghen, pht ra bc x c bc sng nh nht l 5.10-10m (b qua s ta nhit).2727. tnh nng lng ca photon tng ng:A. 3975.10-19J B. 3,975.10-19J C. 9375.10-19J D. 9,375.10-19J2728. Tnh vn tc ca in t p vo i m cc v hiu in th gia hai cc ca ng:A. 629, 6.10 /2484v m sU V 'B. 6296.10 /248, 4v m sU V 'C. 692, 6.10 /2484v m sU V ' D. 6926.10 /248, 4v m sU V '2729.Khi ng hot ng th dng in qua ng l I = 2mA. Tnh s in t p vo i m cc trong mi giy:A. 125.1013B. 125.1014B. 215.1014 D. 215.10132730. Tnh nhit lng ta ra trn i m cc trong mt pht (gi s ton b nng lng ca electron khi n i Catot u bin thnh nhit):A. 298J B. 29,8J C, 928J D. 92,8J2731.Hiu in th gia ant v katt ca ng Rnghen l 15KV. Bc sng nh nht ca tia Rnghen lA. 0,83.10-8m B. 0,83.10-9m C. 0,83.10-10m D. 0,83.10-11m2732. Mt ng pht tia X c hiu in th U=2.104 V. B qua ng nng ban u ca e lc ra khi ca tt. Tr li cc cu hi sau:a. Vn tc ca e khi chm ti ca tt l bao nhiu?A. 0,838.108m/s;B. 0,838.106m/s ; C. 0,638.108m/s;D. 0,740.108m/s .b. Tnh bc sng cc tiu ca chm tia X pht raA. 6,02.10-11m;B. 6,21.10-11m; C. 5,12.10-12m;D. 4,21.10-12m.c. ng nng ca e khi dp vo i ca tt l bao nhiu?A. 4,2.10-15J;B. 3,8.10-15J; C. 3,8.10-16J; D. 3,2.10-15J.2733.Mt ng Rn-ghen pht ra bc x c bc sng nh nht l 5.10-11m, cng dng in qua ng l 10mA.a. Tnh nng lng ca phton Rn-ghen tng ng, hiu in th t vo hai cc ca ng Rn- Ghen, vn tc ca lectron ti p vo i catt?b. Tnh s lectron p vo i catt trong 1 pht?c. Ngi ta lm ngui i catt bng mt dng nc chy qua i catt m nhit lc ra khi i catt ln hn nhit lc vo l 400C. Tnh khi lng nc chy qua i catt trong 1 pht. Cho bit nhit dung ring ca nc l 4200J/kg.K2734. H..th gia catt v i m cc ca ng Rnghen bng 200KV . Cho bit electron pht ra t catt khng vn tc u . Bc sng ca tia Rnghen cng nht m ng pht ra l :A. 0,06B. 0,6 C. 0,04D. 0,08Mu nguyn t Bo quang ph hidroChuyn 62:Mu nguyn t Bo quang ph hidro: Xc nh bc sng (tn s) nguyn t 2Hpht x (hoc hp th) khi c s chuyn trng thi dng, tnh s bc x pht ra, tnh bn knh qu o dng, nng lng cc trng thi dngA. Tm tt l thuyt v cng thc:- Khi nguyn t ang mc nng lng cao chuyn xung mc nng lng thp th pht raphoton, ngc li chuyn t mc nng lng thp chuyn ln mc nng lng cao nguyn t s hp thu photon hf E Ethp cao - Bn knh qu o dng th n ca electron trong nguyn t hir:rn = n2r0Vi r0 =5,3.10-11m l bn knh Bo ( qu o K)- Mi lin h gia cc bc sng v tn s ca cc vch quang ph ca nguyn t hir:21 32 311 1 1 + v 21 32 31f f f + (nh cng vct);- Nng lng electron trong nguyn t hir: 213,6( )nE eVn=- Vi n N*: lng t s.- Cng thc thc nghim: 2 21 21 1 1Rn n _ ,

7 11, 097.10 R m : hng s Ritbec 1 21; 2, 3, 4, ... n n dy Laiman (t ngoi) 1 22; 3, 4, 5, ... n n dy Banme (nhn thy) 1 23; 4, 5, 6,... n n dy Pasen (hng ngoi). Ch : Khi nguyn t trng thi kch thch th n c th pht ra s bc x in t cho bi cng thc: ( ) ! 2 ! 2!2 nnC Nn ;trong 2nC l t hp chp 2 ca n.B. Bi tp c hng dn:V d 1:Trong quang ph ca nguyn t hir, nu bit bc sng di nht ca vch quang ph trong dy Laiman l 1 v bc sng ca vch k vi n trong dy ny l 2 th bc sng ca vch quang ph Htrong dy Banme l bao nhiu?Hng dn gii:

hcE Ehc hc hcE EhcE E ' 2 111 23 22 1 1 23 12V d 2:Trong quang ph hir c bc sng (tnh bng m )ca cc vch nh sau: - Vch th nht ca dy Laiman: 121508 , 021 - Vch H ca dy Banme: 656279 , 032 - Ba vch u tin ca dy Pasen: 8751 , 143 , 2818 , 153 , 0938 , 163 .a. Tnh tn s ca cc bc x trn?b. Tnh bc sng ca hai vch quang ph th 2 v th 3 ca dy Laiman v ca cc vchH ,H, H ca dy banme.Hng dn gii:a. Tn s ca bc x: 810 . 3 cf suy ra:Hz f15682110 . 469 , 210 . 121508 , 010 . 3

Hz f14683210 . 571 , 410 . 656279 , 010 . 3 Hz f14684310 . 6 , 110 . 8751 , 110 . 3

Hz f14685310 . 34 , 210 . 2818 , 110 . 3

Hz f14686310 . 743 , 210 . 0938 , 110 . 3 .b. Ta c:21 1 2hf E E (1)

32 2 3hf E E (2) 43 3 4hf E E (3) 53 3 5hf E E (4) 63 3 6hf E E (5)Cng v vi v ca (1) v (2), ta c: 32 21 31 1 3hf hf hf E E + (6)

32 21 31f f f + hay:32 21 311 1 1 + Suy ra:m 102523 , 0.32 2132 2131+Tng t:- Cng v vi v ca (3) v (6): m 0972 , 0.31 4331 4341+- Cng v vi v ca (2) v (3):m 48613 , 0.32 4332 4342+- Cng v vi v ca (2) v (4):m 43405 , 0.32 5332 5352+- Cng v vi v ca (2) v (5):m 41017 , 0.32 6332 6362+V d 3:Electron ca nguyn t hir trng thi c bn hp th mt nng lng 12,09eV.a. Electron ny chuyn ln trng thi kch thch ng vi mc nng lng no?b. Nguyn t hir sau khi b kch thch nh trn th n s pht ra bao nhiu bc x v nhng bc x thuc dy no?Hng dn gii:a. Nng lng ca nguyn t hir c xc nh bi biu thc:( ) eVnEn 26 , 13 (*)Nng lng ca nguyn t hir trng thi c bn ( ) 1 n: ( ) eV E 6 , 131 Khi hp th nng lng eV W 09 , 12 th n chuyn ln trng thi kch thch ng vi mc nng lng n, c xc dnh t biu thc ca nh lut bo ton nng lng:

eV W E En51 , 1 09 , 12 6 , 131 + + Thay vo (*):( )26 , 1351 , 1neV 3 nVy electron ca nguyn t hir chuyn ln mc nng lng M ( ) 3 n.b. S bc x m sau nguyn t hir pht ra khi chuyn v trng thi cc trng thi c mc nng lng thp hn:( )3! 2 ! 2 3! 323 C NC 2 bc x thuc dy Lai-man (bc x B v C) v 1 bc x thuc dy Ban-me (bc x A).V d 4:Cho mt chm electron bn ph nguyn t hir trng thi c bn kch thch chng.a. Xc nh vn tc nh nht sao cho n c th lm xut hin tt c cc vch ca quang ph pht x ca hir.b. Mun cho quang ph hir ch xut hin mt vch th nng lng ca electron phi nm trong khong no?Hng dn gii:a.Cc mc nng lng ca nguyn t hir c xc nh bi biu thc:( ) eVnEn26 , 13 lm xut hin tt c cc vch quang ph hir th nng lng ca electron phi ln, kch thch nguyn t hir ti trng thi n (lc nng lng ca nguyn t hir bng 0).Theo nh lut bo ton nng lng:

eV E E W 6 , 131

Nng lng ny ca electron di dng ng nng, do vy:s mmWv mv W / 10 . 187 , 210 . 1 , 910 . 6 , 1 . 6 , 13 . 2 221631192 b. ch xut hin mt vch thi th sau khi b electron kch thch nguyn t ch nhy ln mc L. Ngha l nng lng ca electron phi tha mn iu kin:K M K LE E W E E < (L ng vi n=2, M ng vi n=3)

6 , 1336 , 136 , 1326 , 132 2+ < + W

( ) eV eV W eV 09 , 12 2 , 10 < .C. Cu hi v bi tp t luyn tp:2735. Khi chuyn t qu o M v qu o L,nguyn t Hidr pht ra mt photon c bc sng 0,6563 m. Khi chuyn t qu o N v qu o L,nguyn t Hidr pht ra mt photon c bc sng 0,4861 m. Khi chuyn t qu o N v qu o M,nguyn t Hidr pht ra mt photon c bc sng:A.1,1424 m. B.1,8744 m. C.0,1702 m. D.0,2793 m. 2736. Cho bit bc sng di nht trong di Laiman v banme trong quang ph pht x ca nguyn t Hyro ln lt l 0,1217 m v 0, 6576 m . Hy tnh bc sng vch th hai ca dy laiman:A. 0,1027 m B. 0, 0127 m C. 0, 2017 m D. 0, 2107 m 2737. Cho bc sng ca 4 vch quang ph nguyn t Hyro trong dy Banme l vch 0, 6563 H m , vch lam 0, 4860 H m , vch chm 0, 4340 H m , v vch tm 0, 4102 H m . Hy tm bc sng ca 3 vch quang ph u tin trong dy Pasen vng hng ngoi:A. 4353631, 87291, 0931, 2813mmm 'B. 4353631,87291, 28131, 093mmm 'C. 4353631, 78291,82131, 093mmm 'D. 4353631,87291, 28131, 903mmm '2738.Trong quang ph vch ca hiro bc sng di nht trong dy Laiman bng 1215A0, bc sng ngn nht trong dy Banme bng 3650A0, tm nng lng cn thit bt electron ra khi nguyn t hiro khi electron trn qu o c nng lng thp nht. Cho 346, 625.10 h Js ; c = 3.108 m/s; 1A0 = 10-10 mA.0,136eV B.1,38eV C.13,6eV D.136eV.2739. Nng lng ca qu o dng th n trong nguyn t hiro c tnh bi h thc: 213, 6nE eVn(n l s nguyn). Tnh 2 bc sng gii hn ca dy quang ph Banme (do electron chuyn t qu o c mc cao hn v mc n = 2)A.30, 657 ; ' 0, 365 m m B.12 1231, 05.10 ; ' 0, 584.10 m m C.36, 57 ; ' 3, 65 m m D.7 731, 26.10 ; ' 0, 657.10 m m 2740. Bc sng di nht trong dy Banme l 0,6560 m. Bc sng di nht trong dy Laiman l 0,1220 m. Bc sng di th hai ca dy Laiman lA. 0,0528 m;B. 0,1029 m;C. 0,1112 m;D. 0,1211 m2741. Bc sng ca vch quang ph th nht trong dy Laiman l 1220nm, bc sng ca vch quang ph th nht v th hai ca dy Banme l 0,656 m v 0,4860 m. Bc sng ca vch th ba trong dy Laiman lA. 0,0224 m;B. 0,4324 m;C. 0,0975 m;D.0,3672 mE. 0,3475m 2742. Hai vch quang ph c bc sng di nht ca dy Laiman c bc sng ln lt l 1 = 0,1216 m v 2 = 0,1026 m. Bc sng di nht ca vch quang ph ca dy Banme lA. 0,5875 m;B. 0,6566 m;C. 0,6873 m;D. 0,7260 m2743.Bc sng ca vch quang ph u tin trong dy Laiman l o = 122nm, ca vch H trong dy Banme l = 656nm. Bc sng ca vch quang ph th hai trong dy Laiman lA. 10,287nm. B. 102,87nm. C. 20,567nm. D. 205,67nm.2744. Bc sng ca hai vch H v H trong dy Banme l 1 = 656nm v 2 = 486nm. Bc sng ca vch quang ph u tin trong dy Pasen.A. 1,8754 m.B. 0,18754 m. C. 18,754 m. D. 187,54 m.2745. Trong quang ph vch ca nguyn t hir, vch ng vi bc sng di nht trong dy Laiman l 1 = 0,1216 m v vch ng vi s chuyn ca electron t qu o M v qu o K c bc sng 2 = 0,1026 m. Hy tnh bc sng di nht 3 trong dy Banme.A. 6,566 m. B. 65,66 m. C. 0,6566 m. D. 0,0656 m.2746. Cho bn knh quo Bo th hai l2,12.10-10m. Bn knh bng 19,08.10-10m ng vi bn knh qu o Bo thA. 4 B. 5 C. 6 D. 72747. Trong quang ph vch ca hir cho bit vch mu v mu tm c bc sng l H= 0,6563m v H= 0,4102m . Bc sng ngn nht trong dy Pasen l :A. 1,0939mB.0,1094 m C.0,7654 m D.0,9734 m2748. Bc sng ng vi hai vch u tin trong dy Lyman ca nguyn t Hiro l 0, 122 m v103nm . Bc sng u tin trong dy Banme lA. 0,558 m B. 0,661 m C. 0,066 m0,0588 m2749. Mt di sng in t trong chn khng c tn s t 4,0.1014 Hz n 7,5.1014 Hz. Bit vn tcnh sng trong chn khng c = 3.108 m/s. Di sng trn thuc vng no trong thang sng in t?A. Vng tia t ngoi.B. Vng tia hng ngoi.C. Vng nh sng nhn thy.D. Vng tia Rnghen.2750. Cho h= 6,625.10-34J.s; c=3.108m/s. Mc nng lng ca cc qu o dng ca nguyn t hir ln lt ttrong ra ngoi l 13,6 eV; -3,4 eV; -1,5 eV Vi En = -213, 6neV; n= 1, 2, 3 Khi electron chuyn t mc nng lng ng vi n= 3 v n = 1 th s pht ra bc x c tn s :A. 2,9.1014Hz B. 2,9.1015HzC. 2,9.1016Hz D. 2,9.1017Hz2751. Cho bn knh quo Bo thnht 0,53.10-10m. Bn knh qu o Bo th 5 bng :A. 2,65.10-10mB. 0,106.10-10m C. 10,25.10-10m D. 13,25.10-10m2752. Bc sng di nht trong dy Banme l 0,6560m . Bc sng di nht trong dy Laiman l 0,1220m . Bc sng di th 2 ca dy Laiman l:A. 0,0528m B. 0,1029m C. 0,1112m D. 0,1211m 2753. Theo thuyet Bo ,ban knh quy ao th nhat cua electron trong nguyen t hidro la 0r= 5,3.1011m, cho hng s in k= 9.109 22NmC. Hay xac nh van toc goc cua electron tren quy ao nay, xem electron chuyen ong tron eu quanh hat nhan.A. 6,8.1016rad/s B. 2,4.1016rad/s C. 4,6.1016rad/sD. 4,1.1016rad/s2754. Bc sng ca vch quang ph th nht trong dy Laiman l 1220nm, Bc sng ca vch quang ph th nht v th hai ca dy Banme l 0,656m v 0,4860m . Bc sng ca vch u tin trong dy Pasen l:A. 1,8754m B. 1,3627m C. 0,9672m D. 0,7645m 2755. Nng lng ion ho nguyn t Hir l13,6eV. Bc sng ngn nht ca bc x m nguyn t c th pht ra l:A. 0,1220m B. 0,0913m C. 0,0656m D. 0,5672m 2756. Pht biu no sau y v s to thnh quang ph vch ca hir l khngng?A. Cc vch trong dy Lyman c hnh thnh khi lectron chuyn v qu o K.B. Cc vch trong dy Banme c hnh thnh khi lectron chuyn v qu o N.C. Cc vch trong dy Pasen c hnh thnh khi lectron chuyn v qu o M.D. Trong dy Banme c bn vch H, H, H , H thuc vng nh sng nhn thy.2757. Khi electron chuyen ong tren quy ao N cua nguyen t Hydro. Co bao nhieu bc song cua cac bc xa ma nguyen t hidro co the phat ra khi e tr ve lai trang thai c ban?A. 3B. 4 C. 5D.62758. bc sng ca vch quang ph th nht trong dy laiman ca quang ph Hyro l 0,122 m . Tnh tn s ca bc x trnA. 0,2459.1014Hz B. 2,459.1014Hz C. 24,59.1014Hz D.245,9.1014Hz2759. Cho bit bc sng di nht ca dy Laiman v Banme trong quang ph pht x ca nguyn t Hidr ln lt l 0,1217 m v 0,6576 m.Cho h = 6,625.10-34 J.s; c = 3.108 m/s.Bc sng vch th hai ca dy Laiman l:A.0,1027 mB.0,0127 mC.0,2017 m.D.0,2107 m.Chuyn 63:L thuyt tng hp2760. Chn cu ng trong cc cu sau:A. Hin tng quang in chng t nh sng c tnh cht htB. Hin tng giao thoa chng minh nh sng ch c tnh cht sng.C. Khi bc sng cng di th nng lng photon ng vi chng c nng lng cng lnD. Tia hng ngoi, tia t ngoi khng c tnh cht ht.2761. Pht biu no sau y ni v lng tnh sng ht l khngng ?A. Hin tng giao thoa nh sng th hin tnh cht sng.B. Hin tng quang in, nh sng th hin tnh cht ht.C. Sng in t c bc sng cng ngn cng th hin r tnh cht sng.D. Cc sng in t c bc sng cng di th tnh cht sng th hin r hn tnh cht ht.2762. Pht biu no sau y v hin tng quang dn v hin tng quang in l khngng ?A. Cng thot ca kim loi ln hn cng cn thit bt lectron lin kt trong bn dn.B. Phn ln t bo quang in hot ng c vi nh sng hng ngoi.C. Phn ln quang tr hot ng c vi nh sng hng ngoi.D. Ch c t bo quang in c catt lm bng kim loi kim mi hot ng c vi nh sng kh kin.2763. Cho bon bc xa ien t co bc song lan lt la : 1=0,102m; 2=0,485m ;3 =0,859m ; 4= 104 m. Bc xa ien t la tia t ngoaiA. 4 B. 1 C. 2 D. 32764. Thuyt lng t khng gii thch c cc hin tng no sau y ?A. S pht quang ca cc cht. B. Hin tng quang in ngoi.C. Hin tng quang ho. D. Hin tng ion ho mi trng.2765. Hin tng quang in l qu trnh da trn:A. S tc dng ca cc electron ln knh nhB. S gii phng cc photon khi kim loi b t nngC. S gii phng cc electron t b mt kim loi do s tng tc gia chng vi cc photonD. S pht ra do cc electron trong cc nguyn t nhy ra t mc nng lng cao xung mc nng lng thp hn.2766. Hin tng quang in c Hez (Hertz) pht hin bng cch no di y?A. Chiu mt chm nh sng qua lng knhB. Cho mt dng tia catod p vo mt tm kim loi c nguyn t lng lnC. Chiu mt ngun sng giu tia t ngoi vo mt tm km tch in mD. Dng cht Plni 210 pht ra ht bn ph cc phn t Nit2767. Chn cu ng:A. Khi chiu nh sng n sc vo b mt mt tm kim loi th n lm cho cc electron quang in bt raB. Hin tng xy ra khi chiu nh sng n sc vo b mt tm kim loi gi l hin tng quang inC. bn trong t bo quang in, dng quang in cng chiu vi in trngD. bn trong t bo quang in, dng quang in ngc chiu vi in trng2768. Chn cu ng:A. Hiu in th hm ca mi kim loi khng ph thuc bc sng ca chm sng kch thchB. Hiu in th hm c th m hay dngC. Hiu in th hm c gi tr mD. Hiu in th hm c gi tr dng2769. Chn cu sai:A. Cc nh lut quang in hon ton ph hp vi tnh cht sng ca nh sngB. Thuyt lng t do Planck xngC. Anhxtanh cho rng nh sng gm nhng ht ring bit gi l photonD. Mi photon b hp th s truyn hon ton nng lng ca n cho mt electron2770. Chn cu sai:Cc hin tng lin quan n tnh cht lng t ca nh sng l:A.Hin tng quang in B.S pht quang ca cc chtC.Hin tng tn sc nh sng D.Tnh m xuyn2771. Chn cu ng: Gii hn quang in ty thucA. Bn cht ca kim loiB. Hiu in th gia anod v catod ca t bo quang inC. Bc sng ca nh sng chiu vo catodD. in trng gia anod v catod2772.Khi nim no sau y l cn cho vic gii thch hin tng quang in v hin tng pht x nhit electron?A.in tr ring B.Cng thot C.Mt dng in D.Lng t bc x2773. Chn cu ng:Nhn nh no di y cha ng ni dung cc quan im hin i khi ni v bn cht ca nh sng.A. nh sng l sng in t c bc sng nm trong gii hn t m 38 , 0 n m 76 , 0B. nh sng l chm ht c pht ra t ngun sng v truyn i theo ng thng vi tc lnC. S chiu sng chnh l qu trnh truyn nng lng bng nhng phn nh xc nh, gi l photonD. nh sng c bn cht phc tp, trong mt s trng hp n biu hin cc tnh cht ca sng v trong mt s trng hp khc, n li biu hin nh ht (photon)2774. iu no sau y l sai khi ni n nhng kt qu rt ra t th nghim vi t bo quang inA. Hiu in th gia anod v catod ca t bo quang in lun c gi tr m khi dong quang in trit tiuB. Dng quang in vn tn ti ngay c khi hiu in th gia anod v catod ca t bo quang in bng khngC. Cng dng quang in bo ha khng ph thuc vo cng ngun sng kch thchD. Gi tr ca hiu in th hm ph thuc vo bc sng ca nh sng kch thch2775. Hin tng quang in ngoi l:A. Hin tng electron bt ra khi b mt tm kim loi c nh sng thch hp chiu vo n.B. Hin tng electron bt ra khi b mt tm kim loi khi tm kim loi b nung nng n nhit rt caoC. Hin tng electron bt ra khi b mt tm kim loi khi tm kim loi b nhim in do tip xc vi mt vt b nhim in khcD. Hin tng electron bt ra khi b mt tm kim loi do bt k nguyn nhn no khc2776. Pht biu no sau y l sai khi ni v lng t nh sng?A. Nhng nguyn t hay phn t vt cht khng hp th hay bc x nh sng mt cch lin tc m theo tng phn ring bit, t qungB. Chm nh sng l dng ht, mi ht gi l mt photon.C. Nng lng ca cc photon nh sng l nh nhau, khng ph thuc vo bc sng ca nh sngD. Khi nh sng truyn i, cc lng t nh sng khng b thay i, khng ph thuc vo khong cch ti ngun sng2777. Trong cc cng thc nu di y, cng thc no l cng thc Anhxtanh?A.hf = A + 20 ax2mmvB.hf = A - 20 ax2mmvC.hf = A + 22mvD.hf = A - 22mv2778. Cng thc no sau y ng cho trng hp dng quang in b trit tiu?A.eUh = A + 20 ax2mmvB.eUh = 20 ax2mmv C.eUh = 22mvD.12eUh = 20 ax mmv2779. Pht biu no sau y l sai?ng nng ban u cc i ca cc electron quang inA. Khng ph thuc vo cng chm nh sng kch thchB. Ph thuc vo bc sng ca nh sng kch thchC. Khng ph thuc vo bn cht kim loi dng lm catodD. Ph thuc vo bn cht kim loi dng lm catod2780. Chn cu ng:Yu t no nu di y khng gy ra hin tng pht x electron t cc tinh th ion v tinh th ha trA.Cc photon B.Cc ht mang in tchC.T trng D.Nhit cao2781. Chn cu sai trong cc cu sau:A. Hin tng quang dn l hin tng cht bn dn gim mnh in tr khi b chiu sngB. Trong hin tng quang dn, khi c gii phng electron thot khi cht bn dn v tr thnh cc electron dnC. i vi mt bc x in t nht nh th n s gy hin tng quang dn hn hin tng quang inD. Hin tng quang in v hin tng quang dn c cng bn cht2782. Chn pht biu sai.A. Trong hin tng quang in bn ngoi cc electron quang in khi bt ra khi catt lun c mt vn tc ban u v0 > 0B. Pin quang in l ng dng ca hin tng quang in bn trong, cn quang in tr l ng dng ca hin tng quang dn.C. Hin tng quang in bn ngoi c ng dng to ra dng c bin i tn hiu nh sng thnh tn hiu in.D. Hin tng quang in bn trong khi xy ra trong khi bn dn s lm in tr sut ca khi cht bn dn gim.2783. Cu no din t ni dung ca thuyt lng t?A. Mi nguyn t hay phn t ch bc x nng lng mt lnB. Vt cht c cu to ri rc bi cc nguyn t hay phn tC. Mi nguyn t hay phn t ch bc x c mt loi lng tD. Mi ln nguyn t hay phn t bc x hay hp th nng lng th n pht ra hay hp th vo mt lng t nng lng2784. Pht biu no sau y l ng khi ni v hin tng quang dn?A. Hin tng quang dn l hin tng gim mnh in tr ca bn dn khi b chiu sngB. Trong hin tng quang dn, electron c gii phng ra khi khi cht bn dnC. Mt trong nhng ng dng quang trng ca hin tng quang dn l vic ch to n ng (n non).D. Trong hin tng quang dn, nng lng cn thit gii phng electron lin kt thnh electron dn c cung cp bi nhit.2785. Chn cu sai:A.Photon c nng lng B.Photon c ng lngC.Photon c khi lngD.Photon c kch tht xc nh2786. Chn cu ng:Hin tng no sau y KHNG lin quan n tnh cht lng t ca nh sngA.S to thnh quang ph vch B.Cc phn ng quang haC.S pht quang ca cc cht D.S hnh thnh dng in dch2787. Chn cu ng:Nu trong mt mi trng ta bit c bc sng ca lng t nng lng nh sng (photon) l hf v bng , th chit sut tuyt i ca mi trng bng bao nhiu? (Bit h l hng s Plant, C l vn tc nh sng trong chn khng v f l tn s).A.Cnf B.CnfC.Cfn D.nCf2788. Chn cu ng:Nguyn tc hot ng ca quang tr da vo hin tng no?A. Hin tng quang inB. Hin tng quang in bn trongC. Hin tng quang dnD. Hin tng pht quang ca cc cht rn2789. iu no sau y l sai khi ni v quang in tr?A. B phn quan trng ca quang in tr l mt lp cht bn dn c gn hai in ccB. Quang in tr thc cht l mt in tr m gi tr ca n c th thay i nhit C. Quang in tr c th dng thay th cho cc t bo quang inD. Quang in tr l mt in tr m gi tr ca n khng thay i theo nhit 2790. Chn cu ng:Ngi ta khng thy c electron bt ra khi mt kim loi chiu chm nh sng n sc vo n. l v:A. Chm nh sng c cng qu nhB. Kim loi hp th qua t nh sng C. Cng thot ca electron nh so vi nng lng ca photonD. Bc sng ca nh sng ln so vi gii hn quang in2791. Chn cu ng: Electron quang in c ng nng ban u cc i khi:A. Photon nh sng ti c nng lng ln nhtB. Cng thot ca electron c nng lng nh nhtC. Nng lng m electron thu c ln nhtD. Nng lng m electron mt i l nh nht2792. Gi I0 l cng chm nh sng ti mi trng: l h s hp th ca mi trng; d l di ca ng i tia sng. Cng I ca chm nh sng n sc truyn qua mi trng hp thA. doe I I . B.2doe I I C. doe I I21. D. doe I I. 2793. Chn cu ng: Hin tng quang in bn trong l hin tngA. Bt electron ra khi b mt kim loi khi b chiu sngB. Gii phng electron khi mi lin kt trong cht bn dn khi b chiu sngC. Gii phng electron khi kim loi bng cch t nngD. Gii phng electron khi mt cht bng cch bn ph ion2794. Chn cu ng: C th gii thch tnh quang dn bng thuytA.electron c in B.sng nh sngC.photon D.ng hc phn t2795. Linh kin no di y hot ng da vo hin tng quang dn?A.T bo quang in B.Quang trC.n LED D.Nhit in tr2796. Kim loi lm catot ca t bo quang in c gii hn quang in l0 = 0,5m . Chiu nh sng vo catt, chm nh sng khng gy ra hin tng quang in khi lA. tia gamma.B.tia Rn-ghen. C. tia hng ngoi. D. nh sng t ngoi.2797. nh sng Mt Tri chiu vo mt h nc lm nc h nng ln. l do:A.Hin tng phn x nh sng B.Hin tng khc x nh sngC.Hin tng hp th nh sng D.Hin tng tn sc nh sng2798. Chn cu ng: Tm knh A.hp th mnh nh sng B.hp th t nh sng C.khng hp th nh sng xanh D.hp th t nh sng xanh2799. Mu nguyn t Bo khc mu nguyn t Rdpho im no sau y?A. M hnh nguyn t c ht nhnB. Hnh dng qu o ca electronC. Biu thc ca lc ht gia ht nhn v electronD. Trng thi c nng lng n nh2800. Trong quang ph ca nguyn t hiro, cc vch trong dy Laiman c to thnh khi electron chuyn ng t cc qu o bn ngoi v qu oA.K B.L C.M D.N2801. Trong quang ph vch ca nguyn t hiro, cc vch trong dy Banme c to thnh khi cc electron chuyn ng t cc qu o bn ngoi v qu o.A.K B.L C>M D2802. Trng thi dng l:A. Trng thi c nng lng xc nhB. Trng thi m ta c th tnh ton chnh xc nng lng ca nC. Trng thi m nng lng ca nguyn t khng thay i cD. Trng thi m trong nguyn tc th tn ti mt thi gian xc nh m khng bc x nng lng2803. Cu no di y ni ln ni dung ca khi nim v qu o dng?A. Qu o c bn knh t l vi bnh phng ca cc s nguyn lin tipB. Bn knh qu o c th tnh ton c mt cch chnh xcC. Qu o m electron bt buc phi chuyn ng trn nD. Qu o ng vi nng lng ca cc trng thi dng2804. Ni dung ca tin v s bc x v hp th nng lng ca nguyn t c th hin trong cc cu no sau y?A. Nguyn t pht ra mt photon mi ln bc x nh sngB. Nguyn t thu nhn mt photon mi ln hp th nh sngC. Nguyn t pht ra nh sng no c th hp th nh sng D. Nguyn t ch c th chuyn gia cc trng thi dng. Mi ln chuyn, n bc x hay hp th mt photon c nng lng ng bng chnh lch nng lng gia hai trng thi 2805. Chn cu ng:A. Cc vch quang ph trong cc dy Laiman, Banme, Pasen, hon ton nm trong cc vng c nh sng khc nhauB. Vch c bc sng di nht ca dy Laiman c th nm trong vng nh sng nhn thyC. Vch c bc sng ngn nht ca dy Banme c th nm trong vng nh sng t ngoiD. Vch c bc sng di nht ca dy Banme c th nm trong vng nh sng hng ngoi2806. Cc vch trong dy Laiman thuc vng no trong cc vng sau?A. Vng hng ngoiB. Vng nh sng nhn thyC. Vng t ngoiD. Mt phn nm trong vng nh sng nhn thy, mt phn nm trong vng t ngoi2807. Cc vch trong dy Banme thuc vng no trong cc vng sau?A. Vng nh sng nhn thy B. Vng nh sng nhn thy v vng t ngoiC. Vng t ngoiD. Vng hng ngoi2808. Cc vch trong dy Pasen thuc vng no trong cc vng sau?A. Vng hng ngoiB. Vng nh sng nhn thy C. Vng t ngoiD. Mt phn nm trong vng nh sng nhn thy, mt phn nm trong vng t ngoi2809.Bit bc sng ng vi hai vch u tin trong dy Laiman lL1vL2. Bc sng ca vch H trong quang ph nhn thy ca nguyn t hir lA.= 1 22 1.L LL L . B. = 1 21 2.L LL L .C. = 1 21 2.L LL L +. D. = 1 21 2.L LL L +.2810. Tm kt lun sai v cch pht hin tia Rnghen: A. Mn hunh quang B. My o dng hin tng ion ho C. T bo quang in D. Mch dao ng LC2811. gii thch hin tng quang in ta da vo:A. Thuyt sng nh sng B. Thuyt lng t nh sngC. Ga thuyt ca Macxoen D. Mt thuyt khc2812. Cc vch H , H , H , H thuc dyA. Laiman B. Banme C. Pasen D. Dy khc2813. iu no sau y l ng khi ni v s to thnh cc vch trong dy Laiman ca quang ph nguyn t hir? Chn mt p n di y:A. Cc vch trong dy Laiman c to thnh khi cc lectrn chuyn t cc qu o bn ngoi v qu o LB. Theo quy c thng thng, vch s 1 ng vi s chuyn ca lectrn t qu o L v qu o KC. Cc vch trong dy Laiman sp xp mt cch lin tc, gia chng khng c ranh gii r rtD. A, B v C u ng.2814. Pht biu no sau y l sai khi ni v ng nng ban u cc i ca cc lectrn quang in?Chn mt p n di y:A.ng nng ban u cc i ca cc lectrn quang in khng ph thuc vo cng chm sng kch thchB. ng nng ban u cc i ca cc lectrn ph thuc vo bc sng ca nh sng kch thch.D. ng nng ban u cc i ca cc lectrn quang in ph thuc vo bn cht km loi dng lm cattC. ng nng ban u cc i ca cc lectrn quang in khng ph thuc vo bn cht kim loi dng lm catt.2815. Cng thc ng v mi lin h gia ln hiu in th hm ( ), ln in tch electron (e), khi lng electron l (m) v vn tc ban u cc i ca electron ( )max ov:Chn mt p n di yA. mUh =2/e/.v20max ; B. /e/.Uh = m.v20max C.2 /e/Uh = m.v20max D./e/Uh = m.v20max2816. ng nng ban u cc i ca cc lectrn quang inA. khng ph thuc vo cng ca chm nh sng kch thch.B. t l thun vi cng ca chm nh sng kch thch.C. t l nghch vi cng ca chm nh sng kch thch.D. t l thun vi bnh phng cng ca chm nh sng kch thch2817. Pht biu no sau y l ng khi ni v quang ph ca nguyn t hyr?A. Quang ph ca nguyn t hyr l quang ph lin tc.B. Cc vch trong quang ph c mu bin thin lin tc t ti tmC. Gia cc dy Laiman, Banme, Pasen khng c ranh gii xc nhD. A, B v C u sai.2818.Chn pht biu sai khi ni v tnh cht v tc dng ca tia RnghenA. Tia Rnghen c kh nng m xuynB. Tia Rnghen tc dng mnh ln knh nh,lm pht quang mt s chtC. Tia Rnghen khng c kh nng in ho cht khD. Tia Rnghen c tc dng sinh l2819. Trong th nghim Hcx,nu chiu nh sng hng ngoi vo l km tch inm th A.in tch m ca l km mt i.B.tm km s trung ha v in.C.in tch ca tm km khng thay i. D.tm km tch in dng.2820. .Chn cu ngA.Hintng quang in chng t nh sng c tnh cht ht.B.Hin tng giao thoa chng minh nh sng ch c tnh cht sng.C.Khi bc sng cng di th nng lng photon ng vi chng chng c gi tr cng ln.D.Tia hng ngoi,tia t ngoi khng c tnh cht ht.2821.Hin tng quang in l qu trnh da trnA.s tc dng ca cc electron ln knh nhB.s gii phng cc electron khi kim loi b t nng.C.S gii phng cc electron t b mt kim loi do s tng tc gia chng vi cc photon.D.s pht ra cc photon trong qu trnh cc electron trong nguyn t nhy t mc nng lng cao xung mc nng lng thp hn.2822..Pht biu no sau y l ng khi ni v hin tng quang in?A.L hin tng electron bt ra khi b mt tm kim loi khi c nh sng thch hp chiu vo n.B.L hin tng electron bt ra khi b mt tm kim loi khi tm kim loi b nung nng nhit cao.C.hin tng electron bt ra khi b mt tm kim loi khi tm kim loi b nhim in do tip xc vi mt vt b nhim in khc.D.L hin tng electron bt ra khi b mt tm kim loi do bt k nguyn nhn no khc.2823.. Chn cu sai khi ni v hin tng quang in:A.Khi chiu nh sng n sc vo b mt mt tm kim loi th n lm cho cc electron quang in bt ra.B.Hin tng xy ra khi chiu nh sng n sc vo b mt tm kim loi gi l hin tng quang in.C. bn trong t bo quang in,dng quang in cng chiu vi in trng.D.Khi hin tng quang in xy ra,hiu in th lm cho dng quang in trit tiu gi l hiu in th hm.2824. Gii hn quang in ty thuc voA.bn cht kim loi.B.hiu in th gia ant v catt ca t bo quang in.C.bc sng ca nh sng chiu vo catt.D.in trng gia ant v catt.2825. iu no sau y l sai khi ni n nhng kt qu rt ra t th nghim vi t bo quang in?A.Hiu in th gia ant v catt ca t bo quang in lun c gitr m khi dng quang in trit tiu.B.Dng quang in vn tn ti ngay c khi hiu in th gia ant v catt ca t bo quang in bng khng.C.Cng dng quang in bo ha khng ph thuc vo cng chm sng kch thch.D.Gi tr hiu in th hm ph thuc vo bc sng ca nh sng kch thch.2826. Pht biu no sau y l sai khi ni v ng nng ban u cc i ca cc electron quang in?A.ng nng ban u cc i ca cc electron quang in khng ph thuc vo cng chm sng kch thch.B.ng nng ban u cc i ca cc electron quang in ph thuc vo bc sng ca sng kch thch.C.ng nng ban u cc i ca cc electron quang in khng ph thuc vo bn cht kim loi dng lm catt.D.ng nng ban u cc i ca cc electron quang in ph thuc vo bn cht kim loi dng lm catt.2827. Pht biu no sau y l sai khi ni v thuyt lng t nh sng ?A.Nhng nguyn t hay phn t vt cht khng hp th hay bc x nh sng mt cch lin tc m theo tng phn ring bit,t qung.B.Chm nh sng l dng ht,mi ht gi l mt phtn.C.Nng lng ca cc phtn nh sng l nh nhau,khng ph thuc vo bc sng ca nh sng.D.Khi nh sng truyn i,cc lng t nh sng khng b thay i,khng ph thuc khong cch ti ngun sng.2828. Bc sng di nht ca bc x pht ra trong dy Ban-me ng vi electron chuyn t mc nng lngA. E2 v mc nng lng E1. B.E v mc nng lng E1.C. E v mc nng lng E2. D.E3 v mc nng lng E2.2829. Trong th nghim Hecx: chiu mt chm sng pht ra t mt h quang vo mt tm km th thy cc electron bt ra khi tm kim loi. Khi chn chm sng h quang bng tm thy tinh dy th thy khng c electron bt ra na, iu ny chng tA. tm kim loi tch in dng v mang in th dng.B. ch c nh sng thch hp mi gy ra c hin tng quang in.C. nh sng pht ra t h quang c bc sng nh hn gii hn quang in ca km.D.tm thy tinh hp th tt c nh sng pht ra t h quang.2830. Chn cu SAIA.Hin tng quang dn l hin tng in tr ca cht bn dn gim mnh khi b chiu sng.B.Trong hin tng quang dn,cc electron thot ra khi cht bn dn v tr thnh cc electron dn.C.i vi mt bc x in t nht nh th hin tng quang dn gy ra dng in ln hn so vihin tng quang in c dng quang in cha bo ha.D.Hin tng quang in v hin tng quang dn c cng bn cht.2831. Vt sn mu hu nh khng hp th nh sngA. trng.B. tm.C. vng.D. .2832. iu no sau y ng khi ni v pin quang in?A.Pin quang in l mt ngun in trong nhit nng bin thnh in nng.B.Pin quang in l mt ngun in trong quang nng bin i trc tip thnh in nngC.Pin quang in hot ng da trn hin tng cm ng in t.D.C 3 trn u ng.2833.Pht biu no sau y l ng khi ni v hin tng quang dn?A.Trong hin tng quang dn,electron c gii phng ra khi cht bn dn.B.Mt trong nhng ng dng quan trng ca hin tng quang dn lvic ch to n ng(n neon).C.Trong hin tng quang dn,nng lng cn thit gii phng electron lin kt thnh electron dn c cung cp bi nhit.D.Trong hin tng quang dn,mi photon ca nh sng kch thch khi b hp th s gii phng mt electron lin kt thnh mt electron t do.2834. Pht biu no sau y l sai vi ni dung hai gi thuyt ca Bo?A.Nguyn t c nng lng xc nh khi nguyn t ang nm trng thi dng.B.Trong cc trng thi dng,nguyn t khng bc x hay hp th nng lng.C.Khi chuyn t trng thi dng c mc nng lng cao sang trng thi dng c mc nng lng thp,nguyn t s hp th mt phtn.D.Trng thi dng l trng thi m nguyn t c mc nng lng hon ton xc nh.2835.Cc vch trong dy Laiman thuc vng no trong cc vng sau?A.Vng hng ngoi.B.Vng t ngoi.C.Vng nh sng nhn thy.D.Mt phn nm trong vng nh sng nhn thy,mt phn nm trong vng t ngoi.2836.Cc vch trong dy Pasen thuc vng no trong cc vng sau?A.Vng hng ngoi.B.Vng t ngoi.C.Vng nh sng nhn thy.D.Mt phn nm trong vng nh sng nhn thy,mt phn nm trong vng t ngoi.2837. Cu no sau y sai khi eletron ca nguynt Hidr chuyn t qu o M v qu o L.A. Nguyn t pht ra photon c nng lng L ME E B. Nguyn t pht ra photon c tn shE EfL M C. Electron s chuyn t qu o dng c bn knh ln hn sang qu o dng c bn knh nh hn.D. Nguyn t pht ra mt vch quang ph thuc dy Pasen.2838. Cng thot electron ca mt kim loi l Ao, gii hn quang in l o. Khi chiu vo b mt kim loi chm bc x c bc sng = 0,5o th ng nng ban u cc i ca electron quang in bngA. Ao. B. 2Ao. C. 0,75Ao. D. 0,5Ao.2839. Nng lng ca mt phtn c xc nh theo biu thcA. = h . B. = hc.C. = hc. D. = ch.2840. Chiu ng thi hai bc x n sc c bc sng 1v 2 vo mt tm kim loi. Cc electron bt ra vi vn tc ban u cc i ln lt l v1 v v2 vi v1= 2v2 . T s cc hiu in th hm Uh1/Uh2 dng quang in trit tiu lA. 2. B. 3. C. 4. D. 5. 2841. Gii hn quang in ca kim loi l 0. Chiu vo catt ca t bo quang in ln lt hai bc x c bc sng 1 = 20 v 2 =30. Gi U1 v U2 l in p hm tng ng trit tiu dng quang in thA. U1 = 1,5U2. B. U2 = 1,5U1. C. U1 = 0,5U2 . D. U1 = 2U2.2842. Cng thot electron ca mt kim loi l A0, gii hn quang in l0. Khi chiu vo b mt kim loi chm bc x c bc sng = 03 th ng nng ban u cc i ca electron quang in bng:A. 2A0. B. A0. C. 3A0. D. A0/32843. Chn pht biu ng. Trng thi dng ca nguyn t l:A. trng thi ng yn ca nguyn t. B. Trng thi chuyn ng u ca nguyn t. C. Trng thi trong mi lctron ca nguyn t u khng chuyn ng i vi ht nhn. D. Mt trong s cc trng thi c nng lng xc nh, m nguyn t c th tn ti.2844. Chn pht biu ng. trng thi dng, nguyn tA. khng bc x v khng hp th nng lng. B. Khng bc x nhng c th hp th nng lng. C. khng hp th, nhng c th bc x nng lng. D. Vn c th hp th v bc x nng lng.2845. Dy Ban-me ng vi s chuyn lctron t qu o xa ht nhn v qu o no sau y?A. Qu o K.B. Qu o L.C. Qu o M.D. Qu o N.2846. Mu nguyn t Bo khc mu nguyn t R-d-pho im no di yA. Hnh dng qu o ca cc electron . B. Lc tng tc gia electron v ht nhn nguyn t.C. Trng thi c nng lng n nh. D. M hnh nguyn t c ht nhn.2847. Pht biu no sau y l ng?A. Tin v s hp th v bc x nng lng ca nguyn t c ni dung l: Nguyn t hp th phton th chuyn trng thi dng.B. Tin v s hp th v bc x nng lng ca nguyn t c ni dung l: Nguyn t bc x phton th chuyn trng thi dng.C. Tin v s hp th v bc x nng lng ca nguyn t c ni dung l: Mi khi chuyn trng thi dng nguyn t bc x hoc hp th photon c nng lng ng bng chnh lch nng lng gia hai trng thi D. Tin v s hp th v bc x nng lng ca nguyn t c ni dung l: Nguyn t hp th nh sng no th s pht ra nh sng .2848. Dy Laiman nm trong vng:A. t ngoi. B. nh sng nhn thy.C. hng ngoi. D. nh sng nhn thy v mt phn trong vng t ngoi.2849. Dy Pasen nm trong vng:A. t ngoi.B. nh sng nhn thy.C. hng ngoi.D. nh sng nhn thy v mt phn trong vng t ngoi.2850.Trong quang ph ca nguyn t hyr, cc vch , , , trong dy Banme c bc sng nm trong khong bc sng caA. tia Rnghen. B. nh sng nhn thy. C. tia hng ngoi. D. tia t ngoi.2851. Trong quang ph vch hir, bn vch nm trong vng nh sng trng thy c mu lA. , cam, chm,tm. B. , lam, chm, tm.C. , cam, lam, tm. D. , cam, vng, tm2852. Nguyen t hidro trang thai dng ma co the phat ra c 3 bc xa. trang thai nay electron ang chuyen ong tren quy ao dng :A. M. B. N. C. O. D. P2853. Chn cu ng. nh sng hunh quang l:A. tn ti mt thi gian sau khi tt nh sng kch thch. B. hu nh tt ngay sau khi tt nh sng kch thch. C. c bc sng nh hn bc sng nh sng kch thch.D. do cc tinh th pht ra, sau khi c kch thch bng nh sng thch hp.2854. Chn cu ng. nh sng ln quang l: A. c pht ra bi cht rn, cht lng ln cht kh. B. hu nh tt ngay sau khi tt nh sng kch thch. C. c th tn ti rt lu sau khi tt nh sng kch thch. D. c bc sng nh hn bc sng nh sng kch thch.2855. Chn cu sai A. S pht quang l mt dng pht nh sng ph bin trong t nhin.B. Khi vt hp th nng lng di dng no th n pht ra nh sng, l pht quang.C. Cc vt pht quang cho mt quang ph nh nhau.D. Sau khi ngng kch thch, s pht quang mt s cht cn ko di mt thi gian no .2856. Chn cu saiA. Hunh quang l s pht quang c thi gian pht quang ngn (di 10-8s).B. Ln quang l s pht quang c thi gian pht quang di (t 10-6s tr ln).C. Bc sng nh sng pht quang bao gi nh hn bc sng ca nh sng hp th 2857. Tia laze khng c c im no di y:A. n sc cao.B. nh hng cao.C. Cng ln.D. Cng sut ln.2858. Trong laze rubi c s bin i ca dng nng lng no di y thnh quang nng?A. in nng.B. C nng.C. Nhit nng.D. Quang nng.2859. Laze rubi khng hot ng theo nguyn tc no di y?A. Da vo s pht x cm ng.B. To ra s o ln mt . C. Da vo s ti hp gia lctron v l trng.D. S dng bung cng hng.2860. Chn cu ng. Cng ca chm sng n sc truyn qua mi trng hp thA. gim t l vi di ng i ca tia sng.B. gim t l vi bnh phng di ng i ca tia sng. C. gim theo nh lut hm s m ca di ng i ca tia sng. D. gim theo t l nghch vi di ng i ca tia sng.2861. Khi chiu sng vo tm knh chm sng tm, th ta thy c mu g?A. Tm.B. .C. Vng.D. en.2862. Hp th lc la nh sng l:A. hp th mt phn nh sng chiu qua lm cng chm sng gim i.B. hp th ton b mu sc no khi nh sng i qua.C. mi bc sng b hp th mt phn, bc sng khc nhau, hp th khng ging nhau. D. Tt c cc p n trn.2863. Chn cu ng.A. Khi chiu chm sng qua mi trng, cng nh sng gim i, mt phn nng lng tiu hao thnh nng lng khc.B. Cng I ca chm sng n sc qua mi trng hp th gim theo di d ca ng i theo hm s m: I = I0e-t.C. Knh mu l knh hp th hu ht mt s bc sng nh sng, khng hp th mt bc sng no .D. Tt c cc p n A, B, C.2864. Chn cu ng: Mu sc cc vt l do vtA. hp th nh sng chiu vo.B. phn x nh sng chiu vo.C. cho nh sng truyn qua.D. hp th mt s bc sng nh sng v phn x, tn x nhng bc sng khc.2865. Chn cu ng :Chiu mt chm tia hng ngoi vo km tch in m th:A. in tch m ca l km mt iB. Tm km s trung ha v in.C. in tch ca tm km khng thay i.D. Tm km tch in dng2866. Hin tng quang hc no c s dng trong my phn tch quang ph:A. Hin tng khc x nh sng B. Hin tng giao thoa nh sngC. Hin tng phn x nh sng D. Hin tng tn sc nh sng2867. Chn cc cm t thch hp in vo ch trng cho hp ngha: Theo thuyt lng t: Nhng nguyn t hay phn t vt cht nh sng mt cch m thnh tng phn ring bit mang nng lng hon ton xc nh nh sng.A. Khng hp th hay bc x, lin tc, t l thun vi bc sng.B. Hp th hay bc x, lin tc, t l thun vi tn s.C. Hp th hay bc x, khng lin tc, t l nghch vi bc sng.D. Khng hp th hay bc x, lin tc, t l nghch vi tn s.2868. Chn cu ng:Khi hin tng quang in xy ra, nu gi nguyn bc sng nh sng kch thch v tng cng nh sng, ta c:A. ng nng ban u ca cc quang electron tng ln.B. Cng dng quang in bo ha s tng ln.C. Hiu in th hm s tng ln.D. Cc quang in electron n anot vi vn tc ln hn.2869. Hiu sut ca mt laze:A. nh hn 1.B. Bng 1.C. ln hn 1.D. rt ln so vi 1.