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Q.

Energy of singly ionized helium atom in an excited state is equal to the energy of a hydrogen atom in first excited state. Then angular momentum of the electron of the helium ion is

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a

h2π

b

2hπ

c

4hπ

d

3hπ

answer is B.

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Detailed Solution

(2)Energy of an hydrogen - like ion is given byEn=−13.6  Z2n2 eV.∴      −13.6 × 22n2  =− 13.6 × 1222⇒     n=4∴    L=4  ×  h2π=2hπ.
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