Question

What is Doppler Effect in sound? Obtain an expression for the observed
frequency of sound produced by a source when both observer and source are in
motion and medium is at rest.​

Answer 1

Answer:

hey mate

Explanation:

Doppler's effect is the change in the pitch when there is a relative motion between source and observer. Let a source which is at rest be emitting waves of frequency f and wavelength λ. Let V be the velocity of the wave emitted by source, V=fλ

Answer 2

Answer:

Doppler effect

/ˈdɒplərɪfɛkt/

nounPHYSICS

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.