Physics, 28.01.2020 14:11, TightKnowsDaWhey
Apoliceman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 41.2 khz. a car is approaching him at a speed of 33.0 m/s. the wave is reflected by the car and interferes with the emitted sound producing beats. what is the frequency of the beats? the speed of sound in air is 330 m/s.
Answers: 2
, and the frequency of the ultrasound reflected back from the car, 
:
(1)
is the speed of the car
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