Physics - Wave Optics Question with Solution | TestHub

A sound wave of frequency$f$travelling horizontally to the right is reflected by a large vertical plane surface moving to left with a speed$v$. There is a detector ($1$) attached on the surface and another detector ($2$) fixed on ground. If the speed of sound in the medium is$c$, then the difference in the frequency received by detector$2$after being reflected from the surface and the frequency received by detector$1$is