Question

A light approaches the observer with velocity 0.8C . Find the Doppler shift for light of wavelength 5500 Angstrom unit.

Answer 1

Doppler effect for light
(1) $\lambda ={\lambda }_0\frac{1-\frac{v}{c}cos\theta }{\sqrt{1-\frac{v^2}{c^2}}}v=v_0\frac{\sqrt{1-\frac{v^2}{c^2}}}{1-\frac{v}{c}cos\theta }$