Physics

RevisitingBooklet

Name:

6.Waves1

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

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.

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)

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

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?

Reflectionofwaves(physicsonly)

Whatisthelawofreflection?

Requiredpracticalactivity9(physicsonly):ReflectionandRefraction

1. UsingadiagramExplainthedifferencebetweenrefractionandreflection.

2. Drawadiagramtoshowtherelationshipbetweentheincidentandreflectedray.

3. Describeandexplainusingadiagramthepathoflightthroughaglassblockintermsofthespeedoflight.

Soundwaves(physicsonly)(HTonly)

1

2

2 marks

3

4

2 marks

Wavesfordetectionandexploration(physicsonly)(HTonly)

Ultrasound SeismicWaves

Whatisultrasound?

Whatarethepropertiesof

ultrasound?

Whatcanultrasoundbeusedfor?

Whatareseismicwaves?

WhatarePwaves?

WhatareSwaves?

Howcanseismicwavesbeuseful?

TypesofElectromagneticWaves

Useyournotes/textbooktocompletethetable

Type of Wave Penetration Uses Hazards

GammaX-raysUVIRMicro Radio

Requiredpracticalactivity:Infra-red

Drawadiagramtoshowhowa:1) Black,mattsurfaceabsorbsandemitsinfraredradiation

2) Howawhite,shinysurfaceabsorbsandemitsinfraredradiation

Propertiesofelectromagneticwaves

Completethetable!

RadiationType Uses Dangers

Gammarays Treatingcancer/sterilization

X-rays Medical

Ultraviolet Sunbeds

Visiblelight Sight

Infrared Remotecontrols/heattransfer

MicrowavesSatellite

communications/cooking

Radiowaves Communications

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

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

Perfectblackbodiesandradiation(PhysicsOnly)

1. Defineablackbody2. Describethetrendshownbythegraphbelow