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Question

# In a sample of H−atoms,elelctrons de-excite from a level n to 1.The total number of lines belonging to Balmer series are two. If the elelctrons are ionised from level n by photons of energy 13 eV. Then the kinetic energy of the ejected photoelelctrons will be:

A
12.15 eV
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B
11.49 eV
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C
12.46 eV
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D
12.63 eV
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Solution

## The correct option is A 12.15 eVNumber of lines in Balmer series =2 ∴n=4(lines will be 4→2,3→2). Kinetic energy of ejected photoelelctrons =Ephoton−BEn=13−13.642 =13−0.85=12.15 eV

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