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1) A police officer uses a radar gun operating at 1.5 GHz (GHz = Giga-Hertz or 109 Hz). The radio wave from the

gun bounces off your car and heads back towards the radar gun. If you measure a 450 Hz frequency shift, how fast was the car going? in both meters/second (metric units) and the more familiar miles per hour (mph)? Note that because the light is reflected you will need to use a slightly modified doppler formula (different by x2) : v= (deltaf/f)(c/2)

where v is car velocity, f is radar frequency, and c speed of light)

Top Answer

The car's speed is u c a r = 4 5 m / s ... View the full answer

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