A sound wave of frequency travels horizontally to the right and is reflected from a large vertical plane surface moving to left with a speed ν . The speed of sound in medium is c.
(A) The number of waves striking the surface per second is f(c + v)/c
(B) The wavelength of reflected wave is c(c - V/(c + v)
(C) The frequency of the reflected wave is f(c + v)/c - v)
(D) The number of beats heard by a stationary listener to the left of the reflecting surface is f.v/c - v
