Question

Significace of Doppler Effect?

Answer 1

The Doppler effect, or Doppler shift, is the change in the observed frequency of sound or light that occurs when the observer and the source are in relative motion (see Figure 1). Examples of the Doppler effect in everyday life include the change in pitch of the siren of an ambulance or police car as it speeds past. The Doppler effect is important in astronomy because it enables the velocity of light-emitting objects in space, such as stars or galaxies, to be worked out.

Doppler effect

The change in pitch, or frequency, of a sound which results when a source of sound and its observer are moving relative to one another was first predicted by the Austrian physicist and mathematician Christian Andreas Doppler (1803–1853) in a paper on double stars published in 1842. He showed that if the source was approaching the observer (or the observer was approaching the source) then the sound waves would be more crowded (and hence the pitch higher) than if both source and observer were stationary.
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Answer 2

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