The energy of a I,II and III energy levels of a certain atom are E,4E3 and 2E respectively. A photon of wavelength λ is emitted during a transition from III to I. What will be the wavelength of emission for transition II to I?
A
λ2
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B
λ
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C
2λ
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D
3λ
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Solution
The correct option is D3λ For II to I transition, △E=4E3−E⇒hcλII→I;
E3=hcλII→I
For III to I transition, △E=2E−E=hcλ or E=hcλ ∴hc3×λ=hcλII→I