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  • Doppler shift for the light of wavelength emitted from the sun is <img alt="0.04 \AA" src="https://entrance

Doppler shift for the light of wavelength 6000 \AA emitted from the sun is 0.04 \AA. If radius of the sun is 7 \times 10^{8} \mathrm{~m}  then time period of rotation of the sun will be

Option: 1

30 days


Option: 2

365 days


Option: 3

24 hours


Option: 4

25 days.


Answers (1)

best_answer

\text{Doppler shift,} \mathrm{d} \lambda=\frac{\mathrm{v}}{\mathrm{c}} \mathrm{x} \lambda=\mathrm{R}_{\sigma}\left(\frac{\lambda}{\mathrm{c}}\right)

or \, \mathrm{R}\left(\frac{2 \pi}{\mathrm{T}}\right) \frac{\lambda}{\mathrm{c}}=\mathrm{d} \lambda

Substituting values for all parameter, we get

or \, \mathrm{T}=\frac{\mathrm{R} \times 2 \pi}{\mathrm{d} \lambda} \times \frac{\lambda}{\mathrm{C}}
\mathrm{{T}=25\, days}

 

Posted by

seema garhwal

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