A whistle of frequency 540 Hz rotates in a horizontal circle of radius 2m at an angular speed of 15 rad/s. The highest frequency heard by a listener at rest with respect to the centre of circle:
(velocity of sound in air = 330ms−1)
A
590Hz
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B
594Hz
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C
598Hz
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D
602Hz
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Solution
The correct option is B 594Hz Highest frequency at rest, f1=(vv−vs)f vs=rω=30ms−1