A stationary motion detector sends sound waves of frequency 0.0953 MHz toward a truck approaching at a speed of 42.6 m/s. What is the frequency of the waves reflected back to the detector? (Take the speed of sound to be 343 m/s.)

Answer 1

Fr = ((Vs+Vt)/(Vs-Vd))*Fd
Fr = ((343+42.6)/(343-0))*95300Hz =
107,136 Hz = Freq. reflected.