Police use radar guns and the Doppler effect to catch speeders. The figure illustrates a moving car
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Police use radar guns and the Doppler effect to catch speeders. The figure illustrates a moving car approaching a stationary police car. A radar gun emits an electromagnetic wave that reflects from the oncoming car. The reflected wave returns to the police car with a frequency (measured by on-board equipment) that is different from the emitted frequency. One such radar gun emits a wave whose frequency is 8.0 × 109 Hz. When the speed of the car is 39 m/s and the approach is essentially head-on, what is the difference between the frequency of the wave returning to the police car and that emitted by the radar gun?
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REASONING As the car moves toward the wave emitted by the radar gun the car intercepts a greater number of wave crests per second than it would if it ...View the full answer
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Mehwish Aziz
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Related Book For 
Physics
ISBN: 9781119539636
11th Edition
Authors: John D. Cutnell, Kenneth W. Johnson, David Young, Shane Stadler
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