What is known as the K-line of singly ionized calcium has a wavelength of `393.3nm`
Channel: Doubtnut
Date: 2020-08-30

What is known as the K-line of singly ionized calcium has a wavelength of `393.3nm` as measured on earth. In the spectrum of one of the observed galaxies, this spectrial lines is located to `401.8nm`. Determine the speed with which this galaxy is moving away from us..