Physics - Sound Wave Question with Solution | TestHub

A stationary source is emitting sound at a fixed frequency$f_0$, which is reflected by two cars approaching the source. The difference between the frequencies of sound reflected from the cars is$1.2\%$of$f_0$. What is the difference in the speeds of the cars (in$\text{km}$per hour) to the nearest integer ? The cars are moving at constant speeds much smaller than the speed of sound which is$330{\text{ms}}^{\text{-1}}$.