Question

A sound wave of frequency $f$ horizontal 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 wave striking the surface per second is $f\frac{(c+v)}{c}$
• B. The wavelength of reflected wave is $\frac{c(c-v)}{f(c+v)}$
• C. The frequency of the reflected wave is $f\frac{(c-v)}{(c-v)}$
• D. The number of beast heard by a stationary listening to the reflected surface is $\frac{vf}{c-v}$

Answer 1

Answer: (A), (D)

The correct options are
A The number of wave striking the surface per second is $f\frac{(c+v)}{c}$
D The number of beast heard by a stationary listening to the reflected surface is $\frac{vf}{c-v}$