wave (understanding wave)
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TEACHING AND LEARNING MODULES FOR PHYSICS
Form 4
Semester 2
Duration 40 minutes
Learning Area WavesLearning Objectives Understanding Waves
Learning Outcomes A student is able to :-
! describe "#at is meant b$ "ave motion%
2! recogni&e t#at "aves trans'er energ$ "it#out trans'er matter
(! )om*are transverse and longitudinal "aves and give e+am*les eac#%4! ,no" t#e de'inition o' "ave 'ronts%
! State t#e direction o' *ro*agation o' "aves in relation to "ave'ronts
.re-re/uisite: ,no"ledge S1ill #e conce*ts o' distance3 velocit$3 time3 and energ$
aterial L)D3)om*uter and slin1$ tan1%.edagog$: Strategies ec#ni/ues Demonstration and constructivism
Language Focus 5ocabular$ and science *rocess "ords3 'unction "ords
Scienti'ic and6or 7oble 5alue 8eing coo*erative3 s$stematic and inde*endent
9e'lection
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Teaching And Learning Activities
Teachers Activities St!dents Activities "!esti#ns and E$%ected Ans&ers '#ca(!)ar*
% describe "#at
is meant b$"ave motion%
2! recogni&e
t#at "aves
trans'er
energ$
"it#out
ENGAGEMENT
! eac#er tries to attractt#e attentions o'
students b$ as1ing a
/uestion%
2! eac#er s#o"s a 'e"
e+am*les o'
oscillating or
vibrating s$stems
suc# as a s"ing3tuning 'or13 guitar
string3 "ater ri**leetc% A 'un activit$
"ould be to as1 a
student to sing
accom*anied a guitar
*la$er;!
(! eac#er tries to
engage students about
"aves b$ as1ing some
starter /uestionsA**endi+ A!
! teac#er s#o"s a series
o' *articles connected
b$ s*rings% As one
individual *article is
! Students t#in1 andans"er t#e /uestion%
%
From t#e video cli*s
! identi'$ t#e e+am*les o' "aves 'rom
t#e video cli*s
Ans: i!
ocean3tsunami3radio3telecommunication
"aves% eart#/ua1e
2! "#en a "ave *ro*agates3 it carries
energ$3< =es or no< "#at is a reason $ou
WaveWave'ront3
ranverse "ave
Longitudal "ave
5ibration
.ro*agation
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trans'er
matter
disturbed3 it transmits
t#e disturbance to ne+t
interconnected
*article%
2! A tuning 'or1
mounted on a sound board%
said t#at<
Ans: i!
=es% )#ange in *#$sical
! W#at #a**ens "#en one individual
*articles is disturbed<
Ans%
>t transmits t#e disturbance to t#e ne+t
interconnected *article%
(! )om*are
tranverse and
longitudinal
"aves and
give
e+am*leseac#%
EXPLORATION AND
EXPLANATION
see a**endi+ 8!
A**endi+ )!
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4! ,no" t#e
de'inition o'
"ave 'ronts%
! !State t#e
direction o'
*ro*agation
o' "aves in
relation to
"ave'ronts
W#at is "ave 'ronts<
.lane "ave'ronts
)ircular "ave'ronts
eac#er as1s students to
dra" a straig#t line as
"ave direction and a
tangent o' circular "ave
'ronts on a s1etc# o' a
circular t#at alread$ dra"
b$ student at ste* ii!
above%
iv! eac#er t#en veri'iest#e students ans"er% ?#e
direction o' *ro*agation
o' "aves is *er*endicular
to "ave 'ronts@%
EVALUATION
see a**endi+ ) !
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A**endi+ A
Starter uestions:
% Bave $ou ever visited a beac#<
2% Do $ou "atc# t#e "aves moving in and brea1ing on t#e
s#ore< W#$ doesnCt t#e "ater accumulates on t#e beac#<(% >' $ou stand on a sur'ing board3 "#at "ill #a**en to $ou<
W#$ do $ou 'eel t#at t#e "ave carr$ $ou along or 1noc1
$ou over<
4% ive me some e+am*les o' "aves< Do $ou 1no" t#e
di''erent t$*es o' "aves<
eac#erCs ans"ers:
2%#e "ater does not accumulate on t#e s#ore because t#e
t t# t ! ti l ' t# di ! d t
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A%%endi$ +
A%%endi$ ,
St!dents Activit* - L#ngit!dina) and Transverse .aves Si/!)ati#n
Activit* 0 - Transverve .aves 1the h!/an &ave2
Transverse waves are waves that move along a medium where the medium
moves perpendicular to the direction that the wave moves
Materials
15 to 20 students sitting in a row next to each other. There can be manystudents sitting in many rows just like at the football stadium which adds alittle excitement.
Instructions
1. tart at one end of the row and have the first students stand up and sitdown.
2. !ll other student in the row must wait and respond when the wave getsto them.
". #f students are to $uick to respond have them hold hands and close
th i i ti
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8/13/2019 WAVE (Understanding Wave)
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Activity 2 : Longitudinal wave
! compression is characteri'ed by having a particle in the medium moveforward& bump into the next particle in the medium and then bounce back toits original position. This continues with each particle bumping its neighborand then returning to its original position thereby transmitting thedisturbance through the medium.
Materials
! group of people seated side by side and shoulder to shoulder in a row.+eople sitting on a bench (long chair) placed next to each other are in thecorrect orientation for this demonstration.
Instructions
1. #nstruct a person on one side of the room to bend and gently bumpshoulders with their neighbor and return to their normal position.
2. The person bumped responds by bending to bump shoulders with thethird person in line and so on.
Explanation
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Activit* , - C#/%aring a transverse &ave and a )#ngit!dina) &ave3
% Students are to com*are t#e t"o "aves and come u* "it# a list o' similarities and
di''erences%
2% As1 t#e students to visit t#is "ebsite:
#tt*:66"""%1ettering%edu6Edrussell6Demos6"aves6"avemotion%#tml
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A%%endi$ C
02 E$a/%)es #4 &aves 1 4r#/ vide# c)i%2
52 Si/i)arities in &aves &aves
,2 T*%e #4 &aves %r#%agati#n
62 E$a/%)es #4 )#ngit!dina) &aves
72 E$a/%)e #4 tranverse &ave
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TEACHING AND LEARNING MODULES FOR PHYSICS
'orm 4
Semester
Duration 0 minutesLearning Area Waves
Learning Objectives Understanding "aves continuation!
Learning Outcome A student is able to:
G% De'ine i% am*litude ii% .eriod iii% Fre/uenc$ iv% Wavelengt# iv% "ave s*eed
H% S1etc# and inter*ret a dis*lacement-time gra*# 'or a "ave%% S1etc# and inter*ret a dis*lacement-distance gra*# 'or a "ave%
I% )lari'$ t#e relations#i* bet"een s*eed3 "avelengt# and 're/uenc$%
0% Solve *roblems involving s*eed3 "avelengt# and 're/uenc$%
% Describe dam*ing in an oscillating s$stem%
2% Describe resonance in an oscillating s$stem%
.rere/uisite
aterial 9esources
.edagog$ :
Strategies 6 et#od
#in1ing s1ills and t#in1ing strategies3 )onstructivism t#roug# >n/uir$ Discover$3 #aving discussions
7oble values
Learning
O!tc#/e
Teachers activities St!dents activities "!esti#n and e$%ected
ans&ers8 N#tes
'#ca(!)ar*
A student is able
to:
G% De'ine
i% am*litude
ENGAGEMENT
E9PLORATION AND
E9PLANATION
% Am*litude - am*litud
)rest J *unca1
Fre/uenc$ J
're1uensi
Oscillation J a$unan
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eac#er as1ed student to 'orm
grou*s% Kac# grou* "as *rovided
A sim*le *endulum set as s#o"n
in *#otogra*# belo"
eac#er : move *endulum bob to
*oint 8 t#en *oint A and later
*oint ) as s#o"n in *#otogra*#
belo"
Once again teac#er instructed
student to move *endulum bob to
*osition A a+imum *oint!%
>nstruction: .lease measure a
distance bet"een A and 8%
>nstruction2: .lease measure a
distance bet"een ) and 8
eac#er clari'ication: >' A8 "e
consider *ositive direction3 so
-student to move *endulum bob to 8
*osition%
Student measure a
distance bet"een A and
8 b$ using a ruler%
Student measure a
distance bet"een 8 and
) b$ using a ruler%
Student 'ollo" as "#at#as been instructed%
Student ans"er: cm
Student ans"er: - cm
uestion: 7o"3 can $ou
de'ine ?am*litude@
Student ans"er: Am*litudeis a ma+imum
dis*lacement%
.endulum J bandul
.eriod J tem*o#
#roug# J
*alung6lembangan
Wave'ront J mu1a
gelombang
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ii% .eriod
iii% Fre/uenc$
)8 "as negative direction%
Actuall$ A8 and )D is
am*litude 'or t#at oscillating
s$stem
.lease *ut $our *endulum bob to
*oint A and t#en let it oscillate
'reel$ 'rom A to 8 and ) and
return to A%
7o"3 b$ using sto* "atc# to ta1e
time 'or *endulum bob to
oscillate 'rom A to 8 and t#en )
and return to A%
Actuall$3 t#e time $ou #ave ta1en"as t#e *eriod 'or t#e oscillating
s$stem%
>' *endulum bob begin 'rom A
"ent to 8 "ent again to ) and
return to A3 0 times% #ere'ore
t#e time ta1en "as divided to 0
to get *eriod 'or t#e oscillation
s$stem%
7o"3 let sa$3 time ta1en 'or *endulum bob to oscillate 'rom
A to 8 and ) "as s% W#ic# i'
oscillate 'rom A to 8 and ) e/ual
Student 'ollo"s as "#at
#as been instructed%
uestion: W#at time $ou
#ave<
Student ans"er: 0 s
uestion: 8ased on t#e
/uestion and ans"er given3
"#at is *eriod de'inition<
Ans"er : .eriod is time
ta1en 'or t#e oscillating
s$stem to com*lete one
oscillation%
uestion: >' time ta1en 'or
*endulum bob to oscillate
'rom A-8-) is 2 s%
W#at is s$stem 're/uenc$<
Ans"er: M B& or 0%2 B&
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iv% Wavelengt#
iv% "ave s*eed
H% S1etc# and
to a #al' o' one com*lete
oscillation% #ere'ore t#e
're/uenc$ 'or t#e s$stem "as N
6s or N B& or 0% B&%
Or i' "e 1no" t#e *eriod value3
3 t#ere'ore "e can calculate're/uenc$ b$ using relations#i* '
6%
in second%
8$ using trans*arenc$ teac#er
s#o" student Pcircular "ave@ and
?*lane "ave 'ront@ as *#otogra*#
above%
eac#er instruct student to *a$
attention on screen%
Teacher can a)s# sh#& P#&er
%#int %resentati#n 1A%%endi$
A2
Or b$ using ' 6%
2 + 2
4 s
' M
0%2 B&
uestion: 8ased on our
discussion3 "#at is
're/uenc$<
Ans"er : 're/uenc$ is a
number o' com*lete "ave
generated in a second%
eac#er uestion: 8asedon t#e *#otogra*#3 can $outell or s#o" us 'rom "#ere
to "#ere t#e "avelengt# is
measured%
Student ans"er: Student
"ent to in 'ront o' class!
From crest to ne+t crest
and measured in straig#t
line%
5 'Q
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inter*ret a
dis*lacement-
time gra*# 'or a
"ave%
% S1etc# and
inter*ret adis*lacement-
distance gra*#
'or a "ave%
I% )lari'$ t#e
relations#i*
bet"een s*eed3
"avelengt# and
're/uenc$%
0% Solve
*roblemsinvolving s*eed3"avelengt# and
're/uenc$%
% Describe
dam*ing in an
oscillating
s$stem%
2% Describe
resonance in an
oscillating
s$stem%
E'ALUATION -
Teacher instr!ct the st!dents
t# d# the a)%ha(et
s#!%1A%%endi$ +2 and
cr#ss&#rd %!::)e1a%%endi$ C2
A'ter t#is e+*lanation
students "ill com*lete a
"or1 s#eet A**endi+ 8!
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Wave )#aracteristics )ross"ord
0
5 , 6
7
;
<
=
0>
00 05
0, 06
07 0; 0?
0< 0=
5>
50
55
Acr#ss
4% A series o' *ulses generated at regular time intervals in an elastic medium "ill *roduce a RRRRRRRR
% >' t#e *eriod o' a "ave is 2%0 s3 its 're/uenc$ is RRRRB&
G% A *ulse traveling in a s*ringRRRRRR%energ$%
H% As t#e am*litude o' a "ave increases3 t#e energ$ trans*orted b$ t#e "aveRRRR
I% W#ic# *oint on a "ave is 0 degrees out o' *#ase "it# a "ave crest<2% "o "aves #ave t#e same 're/uenc$% W#ic# "ave c#aracteristics must also be identical 'or bot# "aves<
(% W#at is t#e 're/uenc$ o' a "ave "it# a *eriod o' 0%00 s<%%%%%%%%%%B&
% A single vibrator$ disturbance "#ic# moves 'rom *oint to *oint in a material medium is 1no"n as aRRRRR%%
H% #e s*eed o' a "ave de*ends on t#e *ro*erties o' t#e RRR%%and t#e nature o' t#e "ave%
% #e *eriod o' a "ave is t#e time it ta1es to com*lete oneRRR%
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20% Wave motion on a medium trans'erRRRRenerg$%
2% #is "ave *#enomena is created "#en t"o "aves3 "it# t#e same 're/uenc$ and am*litude move in o**osite directions in t#e same medium%
22% )rest to crest ma1esRRRR
D#&n
% )rest to t#roug# overla* ma1esRRRRR%%2% Longitudinal "aves are involved in t#e transmission o' RRRRR%
(% As t#e 're/uenc$ o' a "ave increases3 t#e *eriod o' t#at "aveRRRR
% #e ma+imum dis*lacement o' a *article 'rom its rest *osition due to "ave motion is called RRR%%
0% #e RRRR%% is t#e number o' com*lete "aves *assing a given *oint in a second%% >' t#e 're/uenc$ o' a sound "ave remains constant3 its RRR%can be varied b$ c#anging am*litude%
4% Fre/uenc$ is measured inRRRRRR
G A RRRRR%%*ulse is a single vibrator$ disturbance%
I% An o*era singer can brea1 a glass "it# #er voices because t#e 're/uenc$ o' t#e note and natural vibration 're/uenc$ o' t#e glass areRRRRR
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A%%endi$ +
A)%ha(et s#!%
Bo" man$ "ords t#at relate to t#e "aves do $ou 1no"< W#en $ou unscambled t#ese letters3 t#e$ s*ell several "aves-related "ords%
%=ou need a *encil and a *a*er%
Bere are t#e H4 al*#abets 6 letters
9 . 9 K >
K A 9 9 K
L O 5 F 7 > 59 A O O > >
W S > 5 . O
A A 7 7 B D
L A 7 8 O S 7
U U A > 7
> 9 L D K 7F K . K
L ) A =
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2% #e c#allenge is to unscramble t#e letters to ma1e "aves-related "ords% =ou can unscamble t#e letters using a single s#eet o' *a*er and a *encil3
but it ma$ be easier i' $ou "rite eac# o' t#e letters on a se*arate sli*s o' *a*er and t#en arrange t#e sli*s o' *a*er% Or $ou can cut u* all t#e *ieces and
arrange t#em on t#e given *iece o' *a*er%
(% =ou must use all H4 t#e letters%
4% )an $ou 'ind all t#e "aves-related "ords< Do $ou 1no" "#at eac# "ord means<
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Al*#abet sou*%
%
2%
(%
4%
%
G%
H%
%
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Ans"er 'or al*#abet sou*
.9O.AA>O7
WA5KF9O7
L>B
A.L>UDK
5>89A>O7
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A**endi+ )
WO9,SBKK:
>nstructions: )om*lete t#e labels in t#e diagram b$ *utting in t#e correct "ords% A.L>UDK3 K.OB!
dis*lacement
ime
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Bo" do $ou 'ind t#e 4re@!enc* o' t#is "ave<
dis*lacement
distance
t 0
t M
distance
ar1 6 label t#e "avelengt# on t#e gra*#
Write a 'ormula to s#o" t#e relations#i* bet"een s*eed3 "avelengt# and 're/uenc$<
Solve t#e 'ollo"ing *roblem:
%)alculate t#e am*litude3 're/uenc$ and "avelengt# i' t#e s*eed o' t#e "ave is
cms-
4
( sec
4