GENERAL KNOWLEDGE

Detailed explanation-1: -The Doppler effect, described in 1842 by Christian Andreas Doppler, is the change or shift in the frequency or wavelength of a wave due to relative movement between a sound source or scatterer and the receiver.

Detailed explanation-2: -The waves travel at the same speed, but the observed frequency depends on any relative motion between the observer and source. When the observed frequency changes, so does the wavelength. If the observer and source are moving toward each other, then the frequency increases and the wavelength decreases.

Detailed explanation-3: -Definition: Doppler Effect refers to the change in wave frequency during the relative motion between a wave source and its observer. It was discovered by Christian Johann Doppler who described it as the process of increase or decrease of starlight that depends on the relative movement of the star.