The energy levels of a certain atom for 1st, 2nd and 3rd levels are E, 4E3 and 2E respectively. A photon of wavelength λis emitted for a transition3→1. What will be the wavelength of emissions for transition 2→1
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 D3λ For transition 3→1ΔE=2E−E=hcλ⇒E=hcλ ....... (i) For transition 2→14E3−E=hcλ′⇒E=3hcλ′ ....... (ii) From equation (i) and (ii)λ′=3λ