What is Doppler Effect? Mention the two applications of Doppler effect.

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Solution

An apparent change in the frequency of a wave there is relative motion between the source and observer the Doppler Effect is produced. This phenomenon is known as Doppler Effect.
Two applications:
$∙$ Doppler Effect of light waves is used to track artificial satellites.
$∙$ Doppler effect of radio waves help in protecting the speed of vehicles to Radar gun.

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