Police radars dete1mine speed by measuring the Doppler shift ofradio waves reflected by

Chapter 16, Problem 67

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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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