Q.

A police car moving at 22 m/s chases a motor-cyclist. The police man sounds his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. Calculate the speed of the motorcycle. It is given that the motorcyclist does not observe any beats (Velocity of sound = 330 m/s)

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a

33 m/s

b

22 m/s

c

zero

d

11 m/s

answer is B.

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Detailed Solution

n1 = Apparent frequency heard by the motor cyclist from police van. = n2 = Apparent frequency heard by the motor cyclist from given = when beat frequency is zero, n1 = n2
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