Question

Doppler Effect difine​

Answer 1

Answer:

Doppler Effect.

Whenever there is a relative motion between the observer and the source, the frequency of the sound wave heard by the observer will be different from the frequency of sound wave emitted by the source. This effect is referred to as Doppler Effect.

Answer 2

$\green{✤}$ $\sf\underline\pink{ Doppler \: \: Effect }$ :- The phenomenon of apparent change in frequency received by the observer due to relative motion between sound source and observer is known as "Doppler effect".