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lisabon 2012 [21]
3 years ago
10

A radar gun can determine the speed of a moving automobile by measuring the difference in frequency between emitted and reflecte

d radar waves. What process is used in determining the speed of the car?
Question 7 options:

resonance


refraction


diffraction


doppler effect
Physics
1 answer:
kupik [55]3 years ago
4 0

Answer:

Doppler effect.

Explanation:

The velocity of the moving car affects the wavelengths of the reflecting  radio waves according to the principle of Doppler effect. Therefore, for a car moving away from the radar gun, the wavelength of the radio waves is increased, and for a car moving towards the gun, the wavelength is decreased. The degree of increase or decreases depends on the speed of the car, so if you know how much a wavelength has changed, you know the velocity of the car.

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