What is Doppler Effect? Mention the two applications of Doppler effect.
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.
$$\bullet$$ Doppler Effect of light waves is used to track artificial satellites.
$$\bullet$$ Doppler effect of radio waves help in protecting the speed of vehicles to Radar gun.