Integrated Concepts Police radar determines the speed of motor vehicles using the same Doppler- shift technique employed for ultrasound in medical diagnostics. Beats are produced by mixing the double Doppler-shifted echo with the original frequency. If 1.50x109 -Hz microwaves are used and a beat frequency of 150 Hz is produced, what is the speed of the vehicle? (Assume the same Doppler- shift formulas are valid with the speed of sound replaced by the speed of light.)