The spectral line for a given element in the light received from a distant star is shifted towards longer wavelength side by `0.025%`. Calculate the velocity of star in the line of sight.

Explanation

Given, percentage shift in wavelength,
`(Delta lambda)/(lambda) = 0.025% = (0.025)/(100)`
Velocity of star in line of sight is given by
`velocity = (Delta lambda)/(lambda) xx c = (0.025)/(100) xx 3 xx 10^(8)`
`= 7.5 xx 10^4 m//s`.