NEET Physics Waves Online Test Set A

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Question 1

Question

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15ms–1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is :

(Take velocity of sound in air = 330 ms–1)

Answer

800 Hz

885 Hz

765 Hz

838 Hz