Physics - Sound Wave Question with Solution | TestHub

A submarine$\mathrm{A}$travelling at$18\mathrm{km} {\mathrm{hr}}^{-1}$is being chased along the line of its velocity by another submarine$\mathrm{B}$travelling at$27\mathrm{ }\mathrm{km} {\mathrm{hr}}^{-1}$.$\mathrm{B}$sends a sonar signal of$500\mathrm{ }\mathrm{H}\mathrm{z}$to detect$\mathrm{A}$and receives a reflected sound of frequency$\mathrm{v}$. The value of$\mathrm{v}$is closed to (Speed of sound in water$1500 \mathrm{m }{\mathrm{s}}^{-1}$)