A drone moves at 10 m/s approaching a stationary observer. The frequency of the drone is 380 Hertz and the speed of the sound in the air is 400 m/s. What is the frequency of the sound waves heard by the observer

A higher frequency is received by the observer moving toward the source, and a lower frequency is received by an observer moving away from the source. In general, then, relative motion of source and observer toward one another increases the received frequency. Relative motion apart decreases frequency.

Explanation:

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