In the hydrogen spectrum the wavelength of 
line is 656 nm whereas, in the spectrum of a distant galaxy the 
line has a wavelength of 706 nm. The estimated speed of the galaxy with respect to the earth is
Text Solution
Verified by ExpertsThe correct answer is:
B
2.2 x 10 7 m s -1
Since, the wavelength observed is more than the true wavelength, we can say that the galaxy is receding. Doppler effect in this case gives us
or, 
or, 
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