Question

what is Doppler effect​

Answer 1

Answer:

Doppler effect is an increase (or decrease) in the frequency of :

• sound,
• light,

or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the red shift seen by astronomers.

Answer 2

Doppler Effect:-)

Whenever there is relative motion between the source of sound, the observer and the medium ; the frequency of sound as received by the observer different from the frequency of sound emitted by the source. The Apparent change in the frequency of sound when the source, the observer and the medium are in relative motion is called Doppler effect. For example, consider a man standing on a railway platform. When a train, blowing its whistle, approaches him, the pitch of The vessel appears to rise and it suddenly appears to draw when the engine moves away from him.