The atoms of sample $A$ after passing of light through it

May be in the first excited state

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May be in the second excited state

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May be in both first and second excited states

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None of the above

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Solution

The correct option is B None of the above
Concept: The photon donates all its energy, but not a part of it.
The energy required to excite the ground state electron of H-atom into its first excited state is $10.2 e V$ , into its second excited state is $12.09 e V$ and into its third excited state is $12.75 e V .$
As the energy of photon does not match with either of the excitation energy, thus the electron does not get excited and hence remain in the ground state. And the photon beam passes through the sample A as such having energy $12.5$ $e V .$

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The atoms of sample A after passing of light through it

The atoms of sample $A$ after passing of light through it