what happen 2 d wavelength when star goes away frm earth?

Question

try dopller effect

Answer 1

It's called a 'red shift'. As the star is moving away the light we see from it has an elongated wavelength just as when a diesel train blowing its horn passes you the horn drops in pitch since the source is now receding, resulting in longer wavelengths. Since the red end of the visible spectrum has the longest wavelengths the light from the star is said to be red-shifted, even though the light may still be white or bluish. Scientists use this to figure out how far a star is from us since the further way the star is, the more its light is red-shifted.

Answer 2

Doppler effect works for light as well
Moving away cause a red shift means wavelength will increse and coming closer will cause blue shift the wave length decreases. Simmilar to sound waves

Answer 3

Can yu write what you mean? We educated people do not understand " 2 d" ...