GENERAL KNOWLEDGE

Detailed explanation-1: -The Doppler effect occurs for light as well as sound. For instance, astronomers routinely determine how fast stars and galaxies are moving away from us by measuring the extent to which their light is “stretched” into the lower frequency, red part of the spectrum.

Detailed explanation-2: -If a star is moving away, its light waves get stretched out to longer, redder, wavelengths, producing a redshift. The faster the star, the greater this shift, so observers can measure the line-of-sight speed from the Doppler shift.

Detailed explanation-3: -Astronomers can measure this wobble by using spectroscopy. If a star is traveling towards us, its light will appear blueshifted, and if it is traveling away the light will be redshifted. This shift in color will not change the apparent color of the star enough to be seen with the naked eye.

Detailed explanation-4: -The Doppler Effect is a wave phenomenon observed when there is relative movement of the source in relation to the observer and vice versa. In this phenomenon, frequency variation is observed. It is used to measure how fast stars and galaxies are moving towards or away from us.