1.

The hydrogen like species Li^(2+) is in a spherically symmetric state S_(1) with one radial node. Upon absorbinf light the ion undergoes transition to a state S_(2) The state S_(2) has one radial node and its energy is equal to the ground state energy of the hydrogen atom. The state S_(1) is

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1s
2s
2p
3s

Answer :B


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