Question

What is the Doppler effect? Discuss one practical application of Doppler effect. A bat at rest...

What is the Doppler effect? Discuss one practical application of Doppler effect.

A bat at rest sends out ultrasonic sound waves at 60.0 KHz and receives them returned
from an object moving directly away from it at 30.0 m/s. What is the received sound
frequency?

Two automobiles are equipped with the same single frequency horn. When one is at rest
and the other is moving toward the first at 20 m/s, the driver at rest hears a beat frequency
of 4.5 Hz. What is the frequency that the horns emit? Assume T = 20C

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