Q.

A motor car blowing a horn of frequency 124 vib/sec moves with a velocity 72 km/hr towards a tall wall. The frequency of the reflected sound heard by the driver will be (velocity of sound in air is 330 m/s)

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a

109 vib/sec

b

132 vib/sec

c

140 vib/sec

d

248 vib/sec

answer is C.

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Detailed Solution

Similar to previous question The frequency of reflected sound heard by the driver n'=n v−(−v0)v−vs=n v+v0v−vs=124 330+(72×5/18)330−(72×5/18)=140 vibration/sec
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