Police radars determine speed by measuring the Doppler shift of (mathbb{N T}) radio waves reflected by a

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Police radars determine speed by measuring the Doppler shift of \(\mathbb{N T}\) radio waves reflected by a moving vehicle. They do so by determining the beat frequency between the reflected wave and the \(10.5 \mathrm{GHz}\) emitted wave. Some units can be calibrated by using a tuning fork; holding a vibrating fork in front of the unit causes the display to register a speed corresponding to the vibration frequency. A tuning fork is labeled " \(55 \mathrm{mph}\)." What is the frequency of the tuning fork?

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