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Question

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 D 3λ
For II to I transition,
E=4E3EhcλIII;

E3=hcλIII

For III to I transition,
E=2EE=hcλ or E=hcλ
hc3×λ=hcλIII

λIII=3λ

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