N hydrogen, the transition from level 1 to level 2 has a rest wavelength of 121.6 nm. Suppose you see this line at a wavelength of 124.2 nm in a Star. What is the velocity of this in the direction of the Earth?

velocity of this in the direction of the Earth is 6.4 ×  m/s

Explanation:

given data

wavelength = 121.6 nm

wavelength = 124.2 nm

solution

we get here first change in wavelength that is

= 124.2 nm - 121.6 nm    ...............1

= 2.6 nm  

we get here velocity of direction of the Earth that is express as

    ............2

put here value we get v

v =    

v = 6.4 ×  m/s

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