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Question

Two tuning forks A and B lying on opposite of observer ′O′ and of natural frequency 85 Hz move with velocity 10 m/s relative to stationary observer O. Fork A moves away from the observer while the fork B moves towards him. A wind with a speed 10 m/s is blowing in the direction of motion of fork A. Find the beat frequency measured by the observer in Hz. [Take speed of sound in air as 340 m/s]

Options

A.5
B.6
C.7
D.8

Solution

fobserver for source ′A′ = f0f0 ; fobserver for source ′B′ = f0f0
∴ Beat frequency = f1 - f2 = f0 = 5

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