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WorksheetsSound Waves Doppler
Total questions: 15
Worksheet time: 12mins
When a siren is approaching you, how does the observed pitch of the siren compare to what you hear after it moves past you?
The siren sounds the same throughout
The pitch is higher before it moves past
The pitch gets lower and lower until it reaches me.
The siren's pitch sounds lower after it moves past me.
The pitch gets higher after it moves past me.
Which is the most accurate definition of the Doppler Effect?
It's the way in which sound gets louder and louder as the object gets closer to the observer.
It's the apparent change in the amplitude of a wave caused by relative motion between the source of the wave and the observer.
It's the apparent change in the frequency of a wave caused by relative motion between the source of the wave and the observer.
It's the apparent change in the speed of a wave caused by relative motion between the source of the wave and the observer.
When a siren is approaching you, how does the wavelength of the waves reaching you compare to the wavelength that the siren emits?
The waves of the siren are compressed, so the wavelength of the waves reaching you is shorter than the wavelength that the siren emits.
The waves of the siren are compressed, so the wavelength of the waves reaching you is longer than the wavelength that the siren emits.
The waves of the siren are stretched, so the wavelength of the waves reaching you is shorter than the wavelength that the siren emits.
The waves of the siren are stretched, so the wavelength of the waves reaching you is longer than the wavelength that the siren emits.
What kinds of waves experience the Doppler Effect?
Sound
Light
Water
All of these
Four students are asked: Why are you able to observe the Doppler Effect with sound waves on Earth but not light waves?
Which student has the most accurate answer?
Dave: Because light waves move so quickly, the Doppler Effect doesn't apply to them.
Steve: The Doppler Effect only works on a limited range of frequencies.
Jess: The Doppler Effect works on light waves, but it's moving too fast for us to observe the differences in frequencies.
Jenn: The Doppler Effect is only detectable when the source or observer are moving toward or away from each other at a velocity that is a measurable fraction of the wave being emitted.
When stars are moving away from a telescope, what shade do they appear to be compared to the normal light they emit?
Redder
Bluer
Purpler
Whiter
What is it called when a galaxy is moving toward us at a very high speed?
Redshift
Blueshift
Nightshift
Rightshift
Which of the following is NOT an everyday application of the Doppler Effect mentioned in the video?
Weather forecasts
Police radar detectors
Hand sanitation
Which of the following variables is NOT needed in order to determine the frequency of the wave that will be observed?
Velocity of the source
Velocity of the observer
Velocity of the wave through the medium
Frequency of the wave the source is emitting
The amplitude of the wave
What is created when an object travels faster than the speed of sound?
Sonic boom
Flash of light
Babies
The Doppler Effect
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?
A. Towards the observer, faster than the speed of sound.
B. Towards the observer, slower than the speed of sound.
C. Away from the observer, faster than the speed of sound.
D. Away from the observer, slower than the speed of sound.
Based on what you have seen in the Doppler Effect Gizmo, what is the best definition of the Doppler effect?
A change in the frequency of a wave caused by the motion of the source relative to the observer.
The increase in volume of a sound as the source approaches an observer.
A low-pitched, very loud noise produced by aircraft moving at or above the speed of sound.
The pattern of louder and quieter regions caused by the interference of sound waves.
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
What type of motion is illustrated in the diagram below?
Oscillating motion faster than the speed of sound.
Oscillating motion slower than the speed of sound.
Circular motion faster than the speed of sound.
Circular motion slower than the speed of sound.
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 growing larger.
The distant galaxies are moving towards the Earth.
The distant galaxies are moving away from the Earth.
