1.

A spectral line of wavelength 0.59 mm is observed in the directions to the opposite edges of the solar disc along its equator.A difference in wavelength equal to (Delta lambda), 8 picometre is observed.Period of sun's revolution around its own axis will be about (Radius of sun = 6.95 xx 10^(8)m)

Answer»

30 days
35 days
25 days
365 days

Solution :`(Delta lambda)/(lambda) = (v)/(c)`
`Deltalambda = (lambda v)/(c)`
Change in WAVELENGTH at edges `= pm Deltalambda`
`THEREFORE`Total change in wavelengths,
`delta lambda = 2 Delta lambda = (2 lambda v)/(c)`" `therefore v = (c delatlambda)/(2 lambda)`
Now `T = (2pi R)/(v)` =`(2 PI R. 2 lambda)/(c. delatlambda) = 24.8 approx 25 days`


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