The k line of singly ionised calcium has a wavelength of 393.3 nm as measured on earth. In the spectrum of one of the observed galaxies, this spectral line is located at 401.8 nm . The speed with which the galaxy is moving away from us, will be
Text Solution
Verified by ExpertsThe correct answer is:
A
⇒ ⇒ 
⇒ ⇒ v = 6.48 × × 10 6 m/s = 6480 km/sec .
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