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How is the Doppler effect used to detect the speed of a vehicle?

April 26, 2017detect Doppler speed Used vehicle

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How is the Doppler effect used to detect the speed of a vehicle?

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The Doppler effect can be used with a radar gun. Police can use this device to detect drivers who are traveling above the speed limit. The radar gun emits a radio signal with a known wavelength. A moving car generates a returning wave whose wavelength is picked us be the radar gun. The size of the difference in the two wavelengths shows how fast the moving vehicle is traveling.