Physics - Sound Wave Question with Solution | TestHub

A radar sends an electromagnetic signal of electric field$\left(E_0\right)=2.25 \mathrm{V} {\mathrm{m}}^{-1}$and magnetic field$\left(B_0\right)=1.5\times {10}^{-8} \mathrm{T}$which strikes a target on line of sight at a distance of$3 \mathrm{km}$in a medium. After that, a part of signal (echo) reflects back towards the radar with same velocity and by same path. If the signal was transmitted at time$t=0$from radar, then after how much time echo will reach to the radar?