Question

How is the doppler effect calculated?

Answer 1

1. Doppler effect, generated by the relative motion of the wave source and the observer, is the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer.
2. The frequency fluctuations of a sound or light wave that a moving object produces in relation to an observer are known as the Doppler effect or Doppler shift. When waves from an item traveling towards an observer reach the observer, they are distorted and cause a higher frequency.
3. The Doppler effect takes place for all light and sound sources. For instance, as a sound source moves closer to us, the velocity of the sound waves changes, increasing the pitch. In contrast, as sound waves go away from us, their frequency drops and their pitch flattens.
4. The Doppler effect formula is presented in its generic form as follows: $f=\left(\frac{c\pm v_r}{c\pm v_s}\right)f_0$

Where,

$C$ represents the medium's wave propagation speed,

$V_r$ is stand for speed of the receiver relative to the medium, $+c$ if the receiver is moving towards the source, $-c$ if the receiver is moving away,

$V_c$ is stand for speed of the source relative to the medium, $+c$ if the source is moving away $-c$ if the source is moving towards the receiver.