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 _____.
a-from the brightness of the light
b- from the color of the light
c- from the twinkle of the light
d- from the sound of the light

Answer 1

A. Form the Brightness of the light

Answer 2

a.....................