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

3 s

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2 s

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1 s

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4 s

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Solution

The correct option is C $1 s$
1s is the ground state of a atom and have minimum energy state so that it cannot go in any other lower energy state by emiting photon. So 1s always absorbs photon and never emits photons.

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