Q.

A bus is moving towards a huge wall with a velocity of 5 m/s. The driver sounds a horn of frequency 200 Hz. Speed of sound in air is 342 m/s. Beat frequency heard by passenger is

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a

4 Hz

b

7 Hz

c

6 Hz

d

10 Hz

answer is C.

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Detailed Solution

f′=f0v+vsv−vs=206Hz Beats =f′−f0=6Hz
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A bus is moving towards a huge wall with a velocity of 5 m/s. The driver sounds a horn of frequency 200 Hz. Speed of sound in air is 342 m/s. Beat frequency heard by passenger is