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Question

A photon of energy 70 eV collides with He+ ion. Due to this collision, He+atom gets ionized. The maximum kinetic energy of the emitted electron is

A
13.6 eV
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B
15.6 eV
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C
27.2 eV
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D
31.2 eV
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Solution

The correct option is B 15.6 eV
From Bohr's theory for a hydrogen like atom
En=Z2n213.6 eV
For He+,Z=2 and n=1
E1=54.4 eV

By conserving energy

K.E of electron = Energy of Photon - E1
=7054.4
=15.6 eV

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