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The energy level of an atom for 1 ^(st),...

The energy level of an atom for `1 ^(st),2 ^(nd)` and third levels are E, 4E, 2E respectively. If photon of wavelength `lamda` is emitted for a transition 3 to 1. Calculate the wavelength for transition 2 to 1 in terms of `lamda.`

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`2E-E =E =(hc)/(lamda_(1))(4E)/(3) -E=(E)/(3) =(hc)/(lamda_(2)) implies 3 lamda = lamda_(2)`
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