Waves, Sound, and Physical Optics
Which of the following best describes the Doppler effect?
A train is moving away from a stationary observer. Is the observed frequency higher, lower, or the same as the rest frequency?
In which of the following scenarios would the Doppler effect be observed?
If a sound source is moving towards you, how does the observed frequency change?
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?
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.
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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?
How does increasing the speed of a car approaching you affect the observed frequency of its horn?
How do police radar guns use the Doppler effect to measure speed?