p6 revising booklet waves including triple
TRANSCRIPT
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Physics
RevisitingBooklet
Name:
6.Waves1
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Waves
Topics:1. Transverseandlongitudinalwaves2. Propertiesofwaves3. Requiredpracticalactivity8:Measuringfrequencyand
wavelength4. Reflectionofwaves(physicsonly)5. Requiredpracticalactivity9(physicsonly):Reflectionand
Refraction6. Soundwaves(physicsonly)(HTonly)7. Wavesfordetectionandexploration(physicsonly)(HTonly)8. Typesofelectromagneticwaves9. Propertiesofelectromagneticwaves10. Requiredpracticalactivity10:Infrared11. Propertiesofelectromagneticwaves12. Usesandapplicationsofelectromagneticwaves13. Lenses(physicsonly)14. Visiblelight(physicsonly)15. Emissionandabsorptionofinfraredradiation(physicsonly)16. Perfectblackbodiesandradiation
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TransverseandLongitudinalWaves
Draw a graph to represent a transverse wave, label: • peak • through • Amplitude • Wavelength
Now match up the word to its definition:
1. Trough
2. Crest
3. Amplitude
4. Wavelength
5. Frequency
1. Label on the diagram where compression and rarefaction occur.
2. Label on the diagram a wavelength.
3. What is the direction of vibration compared to the direction of the wave?
For the above diagram, label on the diagram where compression and rarefaction occur.
A. Number of waves produced in each second
B. The peak of a wave
C. Distance from one crest to the next
D. The lowest point of a wave
E. The height of a wave from the
middle to the crest.
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PropertiesofWaves
Usetheformulabelowtoanswerthequestions.YouMUSTshowyourworkingout.
1. Whatistheequationtofindthefrequencyofawave?
2. Whatistheequationtofindthewavelengthofawave?
Calculatethefollowing:(3-4Grade)
1.Thefrequencyofthewavesis0.2Hzandthelengthofeachwaveisestimatedat0.15m.Whatisthewavespeed?
2.Thefrequencyofthewavesis0.4Hzandthelengthofeachwaveisestimatedat0.15m.Whatisthewavespeed?
3.Thefrequencyofthewavesis1.5Hzandthelengthofeachwaveisestimatedat2m.Whatisthewavespeed? 4.Thefrequencyofthewavesis30Hzandthelengthofeachwaveisestimatedat0.2m.Whatisthewavespeed? Calculatethefollowing:(5-7Grade) 1. Thespeedofawavewithafrequencyof10kHzandawavelengthof2m 2. Thespeedofawavewithawavelengthof50cmandafrequencyof4kHz 3. Thefrequencyofawavetravellingat500m/swithawavelengthof25m 4. Thespeedofaradiowavewithawavelengthof3000mandafrequencyof100kHz
wavespeed(v)=frequency(f)xwavelength(λ)
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Requiredpractical:Measuringfrequencyandwavelength
Method
1. Setuptherippletankwithalargesheetofwhitecardorpaperonthefloorunderthetank.
2. Pourwatertoadepthofabout5mmintothetank.
3. Adjusttheheightofthewoodenrodsothatitjusttouchesthesurfaceofthewater.
4. Switchonboththeoverheadlampandtheelectricmotor.
5. Adjustthespeedofthemotorsothatlowfrequencywaterwavesareproduced.
6. Adjusttheheightofthelampsothatthepatterncanbeclearlyseenonthecardonthefloor.
7. Placeametreruleratrightanglestothewavesshowninthepatternonthecard.Measureacross
asmanywavesaspossiblethendividethatlengthbythenumberofwaves.Thisgivesthe
wavelengthofthewaves.
8. Countthenumberofwavespassingapointinthepatternoveragiventime(say10seconds).Then
dividethenumberofwavescountedby10.Thisgivesthefrequencyofthewaves.
9. Calculatethespeedofthewavesusingtheequation:
wavespeed=frequencyxwavelength
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Method
1. Setuptheequipmentasabove,with1meterbetweenthevibrationgenerator&woodenblock(moveablebridge)
2. Switchonthevibrationgenerator.Thestring(orelasticatedcord)shouldstarttovibrate.
3. Adjustthevibrationgeneratoruntilaclearwavepatterncanbeseen.Thewavesshouldlookliketheyarestationary.
4. Thefrequencyisthefrequencyofthepowersupply:
5. Calculatethespeedofthewaveusingtheequation:
wavespeed=frequencyxwavelength
6. Repeatatdifferentlengths,forexample0.9m,0.8m,0.7m,0.6mEvaluateeachmethodforworkingoutthespeedofawave:Youwillneedtoreadthroughthemethodsacoupleoftimestohelpwiththis. Rippletank VibrationgeneratorHowisthewavelengthmeasured?
Whatisthedifficultyinmeasuringthewavelengththisway?
Howreliableiswavelengthmeasured?
Howisthefrequencymeasured?
Whatisthedifficultyinmeasuringthefrequencyinthisway?
Howreliableisthefrequencymeasured?
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Reflectionofwaves(physicsonly)
Whatisthelawofreflection?
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Requiredpracticalactivity9(physicsonly):ReflectionandRefraction
1. UsingadiagramExplainthedifferencebetweenrefractionandreflection.
2. Drawadiagramtoshowtherelationshipbetweentheincidentandreflectedray.
3. Describeandexplainusingadiagramthepathoflightthroughaglassblockintermsofthespeedoflight.
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Soundwaves(physicsonly)(HTonly)
1
2
2 marks
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3
4
2 marks
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Wavesfordetectionandexploration(physicsonly)(HTonly)
Ultrasound SeismicWaves
Whatisultrasound?
Whatarethepropertiesof
ultrasound?
Whatcanultrasoundbeusedfor?
Whatareseismicwaves?
WhatarePwaves?
WhatareSwaves?
Howcanseismicwavesbeuseful?
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TypesofElectromagneticWaves
Useyournotes/textbooktocompletethetable
Type of Wave Penetration Uses Hazards
GammaX-raysUVIRMicro Radio
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Requiredpracticalactivity:Infra-red
Drawadiagramtoshowhowa:1) Black,mattsurfaceabsorbsandemitsinfraredradiation
2) Howawhite,shinysurfaceabsorbsandemitsinfraredradiation
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Propertiesofelectromagneticwaves
Completethetable!
RadiationType Uses Dangers
Gammarays Treatingcancer/sterilization
X-rays Medical
Ultraviolet Sunbeds
Visiblelight Sight
Infrared Remotecontrols/heattransfer
MicrowavesSatellite
communications/cooking
Radiowaves Communications
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Lenses(PhysicsOnly)
WhenObjectisOver2Fawayfromlens Whenanobjectisat2Fawayfromlens
Description:
Description:
Whenanobjectisbetween2FandFfromthelens WhenanobjectisatFdistancefromthelens
Description
Description
WhenthelensisclosertothelensthanF Questions:
1. Whatisthedifferencebetweenconvexandaconcavelens?
2. WhatdoesF,focalpointmean?
3. Whathappenstolightwhenitgoesthroughalens?
Description
F F 2F
2F
F F 2F
2F
F F 2F
2F
F F 2F
2F
F F 2F
2F
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VisibleLight(PhysicsOnly)
1. Whenarayoflightentersglassatanangleitchanges________andthereforechanges________.Thisiscalled______________
2. Therefractiveindexisameasureofhowmuchalightraywill______onpassingfromonemediumtoanother.
3. Whenlightpassesfromonemediumtoanotherandtherefractiveindexishigh,lightbends_____
4. Whenlightpassesfromonemediumtoanotherandtherefractiveindexislowlightbends_______
EXT:Therefractiveindexisdeterminedby........ Keywords refraction,incidence,alot,alittle,speed,direction,medium,refract
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Perfectblackbodiesandradiation(PhysicsOnly)
1. Defineablackbody2. Describethetrendshownbythegraphbelow