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When a spectral line of wavelength lambd...

When a spectral line of wavelength `lambda = 0.60 mu m` is observed in the directions of the opposite edge of the solar disc `(R = 7.0 xx 10^(8)m)` along its equator, there is a difference in wavelength equal to `Delta lambda = 8.0 p m`. Find the period of the sun's revolution about its own axis.

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