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NEET UG PHYSICS MCQ: WAVE OPTICS

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Application +4 | -1

The

k

line of singly ionized 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

View answer and explanation

Correct option: A

6480\,km/s

Option D (0.052777778) is correct because the intensity of scattered light is proportional to the fourth power of the frequency.

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