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- 1. Multiple ChoiceWhich factor does not affect the speed of sound:temperaturedistancedensityelasticity
- 2. Multiple Choice
Which item will sound travel faster through if each medium is at 20 degrees Celsius?
water
dry air
aluminium
- 3. Multiple ChoiceWhat medium does sound travel through slowest?gassolidliquidtrees
- 4. Multiple ChoiceSound is caused by....moleculesvibrationspeoplespace
- 5. Multiple ChoiceSound does not travel in space becauseSpace is too far away.There is no matter in space.Space is the final frontierSpace has planets.
- 6. Multiple ChoiceSound travels FASTEST through which of these materials?AirEmpty spaceMetalWater
- 7. Multiple ChoiceWhen the sound source moves, the frequency changes
ex. police car siren sounding lower pitch after the car passespitchfrequencyDoppler Effectmedium - 8. Multiple ChoiceWhy is sound able to travel faster through a solid than a gas?Gas molecules are packed tightly.Sound does not travel faster through a solid than a gas.Solid molecules are packed tightly.Gas molecules move slowly.
- 9. Multiple ChoiceSound waves move as ________ waves.LongitudinalElectromagneticTransverseMicrowaves
- 10. Multiple Choice
Which wave has the lowest frequency?OrangeGreenBluePurple - 11. Multiple ChoiceWhich waves has the highest pitchOrangeGreenBluePurple
- 12. Multiple Choice
An observer passes a 500 Hz sound source and moves away with a speed of 30 ms-1.
The frequency heard by the moving observer is
quieter and lower pitch
louder and lower pitch
quieter and higher pitch
louder and higher pitch
- 13. Multiple Choice
An observer moves towards a source of sound at a speed of 30 ms-1
If the frequency of the sound to a stationary observer is 500 Hz the frequency to the moving observer is
quieter and higher pitch
louder and higher pitch
quieter and lower pitch
louder and lower pitch
- 14. Multiple Choice
The animation below shows a moving source of waves.
The wave received by an observer behind the source has a frequency of 2 Hz, the frequency in front of the source is
1 Hz
2 Hz
4 Hz
- 15. Multiple Choice
The Doppler effect occurs when a source of waves and/or observer move relative to each other, resulting in the observer measuring a different frequency of the waves than the frequency that the source is emitting.
true
false
- 16. Multiple ChoiceWhen the car moves AWAY from you, its horn seems...Low pitchedHigh pitchedNormal
- 17. Multiple Choice
When an ambulance move TOWARD you it sounds ________ pitched.
high
low
normal
- 18. Multiple ChoiceWhat can you tell about this object's motion?Moving to the North (up).Moving to the South (down).Moving to the West (left).Moving to the East (right).
- 19. Multiple ChoiceWhat can you tell about the motion of this object?Moving left.Moving right quickly.Standing still.Moving up slowly.
- 20. Multiple ChoiceWhen the sound source moves, the frequency changes
ex. ambulance sounds higher in pitch as it approached youpitchfrequencyDoppler Effectmedium - 21. Multiple ChoiceSonar is used forUltrasoundHow to tell how deep things are in wateruntrasonographyall of the above
- 22. Multiple ChoiceYou can hear ultrasoundTrueFalse
- 23. Multiple ChoiceWhat are two ways that an ultrasound is used?transverse waves and longitudinal wavessonar and ultrasound imaginghertz and metersmusic instruments and amplify the sound
- 24. Multiple ChoiceWhat sort of wave is ultrasound?LongitudinalTransverseElectromagnetic
- 25. Multiple ChoiceUltrasound cannot be heard by humans because it is:Below the lower threshold of human hearingAbove the upper threshold of human hearingToo quiet for humans to hear
- 26. Multiple ChoiceWhat does echolocation mean?moving from a cold place to a warm placefinding missing objectsusing sound waves to find objectsseeking shelter from bad weather.
- 27. Multiple ChoiceBats and dolphins find objects in the dark by usingecholocationsonarradarreverberation
- 28. Multiple ChoiceUltrasound imaging can make a picture called asonogrampictogramechogramradargram
- 29. Multiple ChoiceEcholocation involves the _____ of ultrasound waves.reflectionrefractiondiffractiondiffusion
- 30. Multiple ChoiceWhat information is needed to calculate the distance to the submarine?the amount of time it takes the sound waves to returnthe loudness of the returning wavesthe pitch of the returning wavesthe wavelength of the returning waves
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