Doppler shift for the light of wavelength 6000 Å emitted from the sun is 0.04 Å. If radius of the sun is $7 × 10^8 m$ then time period of rotation of the sun will be

30 days 365 days 24 hours 25 days.

25 days.

Doppler shift, $dλ=\frac{v}{c}xλ=R_ϖ(\frac{λ}{c})$ or $R(\frac{2π}{T})\frac{λ}{c}=dλ$ Substituting values for all parameter, we get or $T=\frac{R×2π}{dλ}×\frac{λ}{c}$ T = 25 days