Police radars determine speed by measuring the Doppler shift of radio waves refl

Question

Police radars determine speed by measuring the Doppler shift of radio waves reflected by a moving vehicle. They do so by determining the beat frequency between the reflected wave and the 10.5 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 "50 mph."

What is the frequency of the tuning fork?
Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

f-10.5 = 10.5*v/c

-->f =10.50000175GHz

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