Question
Question: Doppler's effect is valid for light waves also. If a star emitting yellow light accelerates away fro...
Doppler's effect is valid for light waves also. If a star emitting yellow light accelerates away from the earth, the colour of star as observed by an observer on earth –
A
Remains yellow
B
Gradually turns red
C
Gradually turns blue
D
First turns red then blue
Answer
Gradually turns red
Explanation
Solution
Apply Doppler effect,
nred < nyellow < nblue