What is the effect in the change in wave frequency caused by the motion of the source of the wave?

Answer 1

Austrian physicist Christian Johann Doppler (1803-1853)discovered that a wave's frequency changes when the source and observer are in motion relative to one another. This is known as the Doppler effect.

Answer 2

When the observer is moving relative to the wave source, the observer experiences the Doppler Effect. The motion of the source causes a change in the sound's wavelength. Wavelength is inversely proportional to frequency. The apparent frequency is given by the equation:

f = (v-vr)/(v-vs ) * f0

where f is the apparent frequency, v is the wave's velocity, vs is the velocity of the source relative to the medium, and is vr the velocity of the observer relative to the medium.

Imagine a police siren as the car moves toward, then away from you. We've all heard that, right? The siren's frequency increases, passes you, then decreases. It's the relative motion between you and the car that causes your ears to discern a difference in pitch.

Answer 3

Amazingly, the effect, which can be easily detected on a fast moving object, was first theorized before it was shown to actually happen.

The former occurred in 1842; the latter, inspired by that theoretical paper, was in 1845.

Answer 4

It is not the actual change but it is only an apparent change in frequency of the wave due to relative motion between the source and the observer. This phenomenon is known to be Doppler Effect.

Answer 5

The Doppler Effect. Developed by Christian Doppler.

Answer 6

Doppler effect

Answer 7

It's actually the Doppler effect, or Doppler shift