Comprehension V A gas of identical \( \mathrm{H} \)-like atom has some atoms in the lowest (grou...

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Comprehension V
A gas of identical \( \mathrm{H} \)-like atom has some atoms in the lowest (ground) energy level ' \( \mathrm{A} \) ' and some atoms in a particular upper (excited) energy level ' \( B \) ' and there are no atoms in any other energy level. The atoms of the gas make transition to a higher energy level by absorbing monochromatic light of photon energy \( 2.7 \mathrm{eV} \). Subsequently, the atoms emit radiation of only six different photons energies. Some of the emitted photons have energy \( 2.7 \mathrm{eV} \). Some have more and some have less than \( 2.7 \mathrm{eV} \).
The ionization energy for gas atoms is
(a) \( 3.4 \mathrm{eV} \)
(b) \( 12.8 \mathrm{eV} \)
(c) \( 14.4 \mathrm{eV} \)
(d) \( 13.6 \mathrm{eV} \)
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