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The recoil energy of a hydrogen atom aft...

The recoil energy of a hydrogen atom after it emits a photon in going from n = 5 state to n = 1 state is (M = Mass of H atom, R = Rydberg's constant, h = Planck's constant)

A

`(frac{21}{25}Rh)^2frac{1}{2M}`

B

`(frac{18}{25}Rh)^2frac{1}{2M}`

C

`(frac{24Rh}{25})^2frac{1}{2M}`

D

`frac{(Rh)^2}{2M}`

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