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A sound wave of frequency f travels hori...

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

A

The number of waves striking the surface per second is `((c+v))/cv`

B

The wavelength of reflected wave is `(c(c-u))/(v(c+u))`

C

The frequency of the reflected wave as observed by the stationary observer is `v((c+u))/((c-u))`

D

The number of beats heard by a stationary listener to the left of the reflecting surface is `(uv)/(c-u)`

Text Solution

Verified by Experts

The correct Answer is:
D
By the concept of doppler effect Apparent frequency (no. of wave) striking the wall `=upsilon=(C+u)/C upsilon`

frequency of reflected wave (wall become source) `upsilon''=(C+u)/(C-u) upsilon`
Apperent wavelength `C/(upsilon'')=(C(C-u))/(upsilon(C-u))`
So, option A,B,C are correct.
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