An electron with kinetic energy $E e V$ collides with a hydrogen atom in the ground state. The collision will be elastic

for all values of

E

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for

E < 10.2 e V

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for

E < 13.6 e V

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only for

E < 3.4 e V

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Solution

The correct option is B for $E < 10.2 e V$
The hydrogen atom in ground state will only absorb energy greater than $10.2 e V$ . When electron with KE, $E$ eV collides with hydrogen atom in ground state, if energy of an electron is absorbed then collision will be inelastic. If there is no absorption of energy(i.e. $E < 10.2 e V$ ) then collision will be elastic.

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