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Emission and Absorption Spectra

Which electro...

Question

Which electronic level would allow the hydrogen atom to absorb a photon but not to emit it?

1 s

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2 s

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3 s

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2 p

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Solution

The correct option is A $1 s$
1s electronic level would allow the hydrogen atom to absorb a photon but not to emit it. On absorption of radiation, electron will be transferred from 1s level to higher level such as 2s or 3s. But to emit a photon, the electron should go to the lower energy level from higher energy level. Since 1s is the lowest energy level, the electron cannot go to a lower level. Hence, emission is not possible.

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I E_{1}

I E_{2}

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