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The radar used by police to check over-speeding vehicles, works on the principles of
Question

The radar used by police to check over-speeding vehicles, works on the principles of

A.

Induction effect

B.

Raman effect

C.

Doppler effect

D.

Coulomb effect

Correct option is C

The radar used by police to check over-speeding vehicles operates on the Doppler effect. This principle involves the change in frequency or wavelength of a wave in relation to an observer moving relative to the wave source. When a vehicle approaches or moves away from the radar, the frequency of the reflected radar waves changes. By measuring this frequency shift, the radar device can calculate the speed of the vehicle.

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