The collision of an electron with kinetic energy 
and a hydrogen atom in its ground state can be described as
Text Solution
Verified by ExpertsThe correct answer is:
D
The energy required to excite a hydrogen atom from ground state 
to first excited state 
is
When an electron collides with hydrogen atom in the ground state with energy of 
which is less than 
, then it will not be able to excite hydrogen atom into first excited state. Therefore, electron will not give any energy to the hydrogen atom. Hence, the total kinetic energy of electron remains conserved. So, collision is elastic.
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