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A small source of sound vibrating at frequency 500 Hz is rotated in a circle of radius $\frac{100}{π}$ cm at a constant angular speed of 5.0 revolutions per second. A listener situates himself in the plane of the circle. Find the minimum frequency of the sound observed. Speed of sound in air = 332 m/s.

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485 Hz

470 Hz

495 Hz

450 Hz

answer is A.

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Detailed Solution

$v_{s} = r w n^{1} = (\frac{v}{v + v_{s}}) \cdot n$

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