Ⓒ Cengage Learning/Ed DoddSPEEDLIMIT25YOUR SPEEDPolice radar guns measure the speed of moving vehicles by transmitting electromagnetic waves at a vehicle and detecting a Doppler shift in the reflected wave. Suppose a police radar transmits at afrequency of 25.8 GHz and receives a wave reflected from a car moving toward the radar at 67.0 mph.(a) Find the frequency shift Af = f - fs (in Hz) between the observed (received) and source (transmitted) frequencies.X Hz(b) If the beat frequency measurement in part (a) is accurate to ±5.5 Hz, how accurate is the speed measurement?X m/s

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