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23 Nov 2019
Police radars determine speed by measuring the Doppler shift ofradio waves reflected by a moving vehicle. They do so bydetermining the beat frequency between the reflected wave and the10.5 GHz emitted wave. Some units can be calibrated by using atuning fork; holding a vibrating fork in front of the unit causesthe display to register a speed corresponding to the vibrationfrequency. A tuning fork is labeled "50 mph."
What is the frequency of the tuning fork?
Express your answer to two significant figures and include theappropriate units.
f = _________
Police radars determine speed by measuring the Doppler shift ofradio waves reflected by a moving vehicle. They do so bydetermining the beat frequency between the reflected wave and the10.5 GHz emitted wave. Some units can be calibrated by using atuning fork; holding a vibrating fork in front of the unit causesthe display to register a speed corresponding to the vibrationfrequency. A tuning fork is labeled "50 mph."
What is the frequency of the tuning fork?
Express your answer to two significant figures and include theappropriate units.
f = _________
