Officer Ricky points a radar gun at a car. A speeding car likely has _____ frequency waves bouncing off of it.
higher lower
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A: As the car approaches the radar gun, the reflected microwaves get bunched up in front of the car. Therefore, the waves the receiver detects have a higher frequency than they would if they were being reflected from a stationary object. The faster the car is moving, the greater the increase in the frequency of the waves.
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