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Question

nEnergy above ground state
37 eV
23 eV
10 eV
There are three lowest energy levels of an atom, if atom is in n=3 energy level. What is the possible energy of photon emitted in single transition ?

A
3e V only
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B
4e V only
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C
7e V only
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D
4e V or 7e V only
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E
3e V or 4e V only
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Solution

The correct option is D 4e V or 7e V only
The possible single transitions that can occur are n3n2 and n3n1.
Thus the possible energies of photons are 7eV3eV=4eV
and 7eV0eV=7eV

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