A source of sound of frequency 256 Hz is moving rapidly towards a wall with a velocity of 5 m/s. The speed of sound is 300 m/s. If the observer is between the wall and the source, then beats per second heard will be

Options

(a) 7.8 Hz
(b) 7.7 Hz
(c) 3.9 Hz
(d) Zero

Correct Answer:

7.8 Hz

Explanation:

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