A source which is emitting sound of frequency f is initiall…

Physics Wave and Sound General MCQ (Single Correct)

A source which is emitting sound of frequency f is initially at (– r, 0) and an observer is situated initially at (2r, 0). If observer and source both are moving with velocities and , then which of the following is correct option?

Apparent frequency first increases, then decreases and observer observes the original frequency once during the motion.

Apparent frequency first increases, then decreases and observer observes the original frequency twice during the motion.

Apparent frequency first increases, then decreases during the motion and observer never observes the initial frequency.

Apparent frequency continuously decreases and once during the motion, observer hears the original frequency.

Text Solution

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The correct answer is:

velocity of approach of observer & source decreases, becomes zero and finally becomes velocity of separation.

Hence apparent frequency continuously decreases. (f app = f when v app = 0)

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