. If we take into account the reality that both the nucleus and electron revolve around their common centre of mass

. During electron transition from a higher state, n2, to a lower state, n1, we find that the wavelength of the photon emitted is not given by the formula  were where R is the Rydberg constant. The correct wavelength, in that case depends on mass of electron (m) and mass of he nucleus (M) and is given by


Best Answer

Ans: D

Sol: When nucleus in not stationary, then correct wavelength depends on m = mass of electron and mass of nucleus = 


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