GENERAL KNOWLEDGE

Detailed explanation-1: -Likewise, if a star is zooming away from you, any light it emits gets stretched. You see these stretched-out light waves as having a lower frequency. Since red is at the low-frequency end of the visible spectrum, we say that light from a receding star is shifted toward red, or redshifted.

Detailed explanation-2: -The faster a star moves towards the earth, the more its light is shifted to higher frequencies. In contrast, if a star is moving away from the earth, its light is shifted to lower frequencies on the color spectrum (towards the orange/red/infrared/microwave/radio end of the spectrum).

Detailed explanation-3: -Answer and Explanation: A star appears to be redshifted when it is moving away from the earth. In this case, the wavelengths of the emitted light by the star seems to have shifted towards the red end of the electromagnetic spectrum. This is an indication that the universe is continuously expanding.

Detailed explanation-4: -This shifts the star’s spectral lines toward the red end of the spectrum. And, The red end of the spectrum has a lower pitch or frequency. Hence, the star is receding the earth and the apparent frequency is lesser than actual.