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The energy levels of a certain atom are ...

The energy levels of a certain atom are represented in adjoining figure. During the transition from
2E to E level, a photon of wavelength `lambda` is emitted. The wavelength of photon produced during transition from `(4)/(3)` E level to E will be

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The correct Answer is:
`(lambda)/(m)`
`1/3 E=(hc)/lambda=lambda=(3hc)/E` when `E'=E, lambda'=(hc)/E=lambda/3`
So new wavelength `=lambda/3`
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