Questions
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
detailed solution
Correct option is A
Δλλ=vcÞ (401.8−393.3)393.3=v3×108Þ v = 6.48 ´106 m/s = 6480 km/sec.Talk to our academic expert!
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The wavelength of light coming from a distant galaxy is found to be 0.5% more than that coming from a source on earth, then the velocity of galaxy is _____
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