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When a photon is emitted from an atom , ...

When a photon is emitted from an atom , the atom recoils.The kinetic energy of recoil and the energy of the photon come from the difference in energy between the state involved in the transition. Suppose a hydrogen atom change its state from `n = 3 to n = 2` .Calculate the fractional change in the wavelength of light emitted , due to the recoil.

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The correct Answer is:
`((E-E'))/(E)xx100-0.55xx10^(-6)%`
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