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- 1. Multiple Choice
Long sound waves are...high pitchedlow pitchedmedium pitched - 2. Multiple ChoiceShort sound waves are...high pitchedlow pitchedmedium pitched
- 3. Multiple ChoiceWhen the car moves AWAY from you, its horn seems...Low pitchedHigh pitchedNormal
- 4. Multiple ChoiceWhen an ambulance move TOWARD you it sounds ________ pitched.highlowmedium
- 5. Multiple ChoiceThe Doppler effect is seen when a wave-making source moves toward an observer.TrueFalse
- 6. Multiple ChoiceThe Doppler effect occurs when an observer moves towards a wave-making source.TrueFalse
- 7. 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).
- 8. Multiple ChoiceWhen a car moves towards you, the sound of its horn seems relatively...Low pitchedHigh pitchedNormal
- 9. Multiple ChoiceWhat direction is this object moving?leftrightupdown
- 10. Multiple ChoiceWhat can you tell about the motion of this object?Moving left.Moving right quickly.Standing still.Moving up slowly.
- 11. Multiple Choice
In this clip, the sound of the jet illustrates the doppler effect AS OBSERVED BY
The man on the ground
The pilot in the jet
Both the man on the ground and the pilot in the jet
- 12. Multiple Choice
From the perspective of the camera's position, the ambulance's siren sound should
rise in pitch.
fall in pitch.
stay the same pitch.
- 13. Multiple Choice
What is the Doppler Effect?
A change in frequency due to the relative motion of a wave source and an observer
When a wave overlaps with another wave
When a wave bounces off of another object
When a wave bends due to traveling through a different medium
- 14. Multiple Choice
The pitch of a sound wave relates to the wave's _________________.
Amplitude
Frequency
Wavelength
Period
- 15. Multiple Choice
You are standing on the side of the road when a police car races past you with its siren on. After the police car passes you, what happens to the pitch of the siren?
It increases
It decreases
It turns red
- 16. Multiple Choice
Look at the picture. Who is experiencing a lower pitched sound?
Observer A
Observer B
There is no difference
- 17. Multiple Choice
The Doppler effect applies to light waves as well as sound waves. Astronomers use this to measure the motion of stars and galaxies. In 1929, Edwin Hubble discovered that light from distant galaxies was shifted away from the blue end of the spectrum and towards the red end of the spectrum. Red light has a longer wavelength (and a lower frequency) than blue light. What could Hubble conclude about these galaxies?
The distant galaxies are growing smaller.
The distant galaxies are moving towards the Earth.
The distant galaxies are moving away from earth
- 18. Multiple Choice
The car below emits sound waves, represented by red circles, that are heard by an observer. Based on the pattern of sound waves, what is the direction and speed of the car?
toward the observer, faster than the speed of sound
toward the observer, slower than the speed of sound
away from the observer, faster than the speed of sound
away from the observer, slower than the speed of sound
- 19. Multiple Choice
Assuming the speed of sound is 340 m/s, what is the most likely speed of the jet shown below?
200 m/s
500 m/s
100 m/s
340 m/s
- 20. Multiple Choice
How do you calculate the magnitude of the doppler shift?
Divide frequency in front of sound source by frequency behind the source
Multiply the wavelength of the wave in front of the source by the velocity of sound
Multiply velocity of sound by the velocity of source
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