Question

The Doppler effect suggests that sound waves are relative to the observer. You know if an object is coming or going from the sound it makes. Light waves follow the Doppler effect also. However, instead of sound changing, you know if an object is coming or going _____.

Answer 1

are there any options

Answer 2

from the brightness of the light

Answer 3

yes. The light waves get compressed or strected

Answer 4

But its the shade of light that shows if its moving closer or further. If its bluer, then its moving towards you. If its redder, its moving away