Police radars dete1mine speed by measuring the Doppler shift ofradio waves reflected by
Chapter 16, Problem 67(choose chapter or problem)
Police radars dete1mine speed by measuring the Doppler shift ofradio waves reflected by a moving vehicle. They do so by determiningthe beat frequency between the reflected wave and the I 0.5 GHzemitted wave. Some unit~ can be calibrated by using a tuning fork;holding a vibrating fork in front of the unit causes the display toregister a speed corresponding to the vibration frequency. A tuningfork is labeled "55 mph." What is the frequency of the tuning fork?
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