JEE Advanced 2020 Full Test 2 Paper 1

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Question : 12 of 54

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A sound wave of frequency v travels horizontally to the right. It is reflected from a large vertical plane surface moving to the left with a speed V. The speed of sound in the medium is c.

The number of wave pulse striking the surface per second is ‌
v(c+V)
c
The wavelength of the reflected wave is ‌
c(c−V)
v(c+V)
The frequency of the reflected wave is ‌
v(c+V)
(c−V)
The number of beats heard by a stationary listener to the left of the reflecting surface is ‌
vV
c−V

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