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20 April, 05:10

A radar gun can determine the speed of a moving automobile by measuring the difference in frequency between emitted and reflected radar waves. What process is used in determining the speed of the car?

Question 7 options:

resonance

refraction

diffraction

doppler effect

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Answers (1)
  1. 20 April, 05:19
    0
    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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