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Q)

The hydrogen-like species $Li^{2+}$ is in a spherically symmetric state $S_1$ with one radial node. Upon absorbing light the ion undergoes transition to a state $S_2$ has one radial node and its energy is equal to the ground state energy of hydrogen atom. The orbital angular momentum quantum number of the state $S_2$ is

$(a)\;0\qquad(b)\;1\qquad(c)\;2\qquad(d)\;3$

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A)
Azimuthal quantum number for $S_2$ = l =1
Hence the orbital angular momentum quantum number of the state $S_2$ is 1
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