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As shown if Fig. a vibrating tuning fork of frequency 512 Hz is moving towards the wall with a speed `2(m)/(s)`. Take speed of sound as `v=340(m)/(s)` and answer the following questions.
Q. Suppose that a listener is located at rest between the tuning fork and the wall. Number of beats heard by the listener per second will be
A. 4
B. 3
C. 0
D. 1

1 Answer

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Correct Answer - B
The frequency heard directly from source is given by
`f_1=((v)/(v-v_S))f`
Here `v=340(m)/(s)`,`v_S=2(m)/(s)`,`f=512Hz`
`f_1=(340)/(338)xx512=515Hz`
the frequency of the wave reflected from wall will be same (no relative motion between wall and listener, so no change in frequency). Hence no beats are observed.

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