Home Physics Wave and Sound Vibration of String A motor car blowing a horn of frequency 124 …
Physics Wave and Sound Vibration of String MCQ (Single Correct)

A motor car blowing a horn of frequency 124 vibration/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)

A
109 vibration/sec
B
132 vibration/sec
C
140 vibration/sec
D
248 vibration/sec

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The correct answer is:
C

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The frequency of reflected sound heard by the driver

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