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Q.

In a sample of H-atoms, electrons de-excite from a level 'n' to 1. The total number of lines belonging to Balmer series are two. If the electrons are ionised from level 'n' by photons of energy 13 e V. Then the kinetic energy of the ejected photoelectrons will be:

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a

12.46 eV

b

12.63 eV

c

12.15 eV

d

11.49 eV 

answer is A.

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Detailed Solution

Here, 

We have;

n = 4 because only 2 Balmer lines are obtained.

i.e., 4→2, 3→2

KE=13−13.642

KE=12.15 eV.

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