Waves, Sound, and Physical Optics
Which of the following best describes the Doppler effect?
In which of the following scenarios would the Doppler effect be observed?
Two cars are moving on a highway. Car A is chasing Car B. Both are moving at constant speed, but Car A is faster. What does the driver of Car B hear regarding the sound from Car A's horn?
If a sound source is moving towards you, how does the observed frequency change?
A train is moving away from a stationary observer. Is the observed frequency higher, lower, or the same as the rest frequency?
Three observers are listening to a siren. Observer A is stationary, Observer B is moving towards the siren, and Observer C is moving away from the siren. Rank the observed frequencies from highest to lowest.
How does increasing the speed of a car approaching you affect the observed frequency of its horn?
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A car is moving towards you at 20 m/s, and then it speeds up to 40 m/s. How does the change in frequency compare between the two speeds?
Which of the following technologies uses the Doppler effect?
How do police radar guns use the Doppler effect to measure speed?