Question

Suppose the earth is revolving in a perfectly circular orbit around the sun, while the sun is stationary at the center of this orbit. The light waves received by an observer at earth will show,

• A. Red shift
• B. Blue shift
• C. No shift
• D. Both $\left(A\right)$ and $\left(B\right)$ alternately.

Answer 1

The correct option is C No shift

As the earth revolves around the sun in circular orbit, there is no change in the distance between the observer and the Sun. So, there will be no change in wavelength of light received by the observer on earth.

Hence, $\left(C\right)$ is the correct answer.