Question

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Answer 1

The doppler effect is the perceived change in frequency of sound emitted by a source moving relative of a observer : as a plane flies overhead ,the note of the engine becomes noticeably lower,as does the siren noise from a fast moving emergency vehicle as it passes.

A doppler radar is a specialized radar that uses the doppler effect to produce velocity data about objects at a distance .it does this by bouncing a microwave signal off a desired target and analyzing how the objects motion has altered the frequency of the returned signal.

The doppler effect is a phenomenal observed whenever the source of waves is moving with respect to an observer .that was the doppler effect - a shift in the apparent frequency for a sound wave produced by a moving source.

When the distance is decreasing,the frequency of the received wave form will be higher than the source wave form.besides sound and radio waves ,the dollar effect also affects the light emitted by other bodies in space.. If it is " red shifted" the light waves are spread apart,and it is traveling away from us...