A police officer in a stationary car measures your speed by means of an ultrasonic device that emits sound at 39.6 kHz. You approach the officer at 35.0 m/s and the wave reflected by your car interferes with the emitted sound producing beats. What is the frequency of the beats when the speed of sound in air is 343 m/s?
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A police officer in a stationary car measures your speed by means of an ultrasonic device that emits...
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