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
B
500 cycles/sec
C
550 cycles/sec
D
450 cycles/sec

Solution

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

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