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Question

The energy levels of a certain atom for 1st, 2nd and 3rd levels are E, 4E3 and 2E respectively. A photon of wavelength λ is emitted for a transition 31. What will be the wavelength of emissions for transition 21

A
λ3
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B
4λ3
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C
3λ4
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D
3λ
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Solution

The correct option is D 3λ
For transition 31 ΔE=2EE=hcλE=hcλ ....... (i)
For transition 21 4E3E=hcλE=3hcλ ....... (ii)
From equation (i) and (ii) λ=3λ

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