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Question

A source of sound of frequency 450 cycles/sec is moving towards a stationary observe with 34 m/sec speed. If the speed of sound is 340 m/sec, then the apparent frequency will be


A
410 cycles/sec
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B
500 cycles/sec
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C
550 cycles/sec
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D
450 cycles/sec
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Solution

The correct option is B 500 cycles/sec
Appearant frequency is given as;
$$n' = n \left (\frac{v} {v - v_0}  \right ) = 450 \left (\frac{340} {340 - 34}  \right ) = 500 $$ cycles/sec

Physics

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