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1.8 g hydrogen atoms are excited by a ra...

`1.8 g` hydrogen atoms are excited by a radiation. The study of species indicates that `27%` of the atom are in third energy level and `15 %` of atom in second energy level and the rest in ground state. If IP of H is `13.6 eV`, calculate
a. Number of atoms present in first and third energy levels
b. Total energy involved when all the atoms return to the ground state.

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