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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

a
h2π
b
2hπ
c
4hπ
d
3hπ

detailed solution

Correct option is B

(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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In a sample of ions, a Li++ ion electron in first Bohr orbit is excited to a level by a radiation of wavelength λ. When the ion gets de-excited to the ground state in all possible ways (including intermediate emissions), a total of six spectral lines are observed. What is the value of λ ?

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