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An electron with kinetic energy 5eV is i...

An electron with kinetic energy `5eV` is incident on a hydrogen atom in its ground state.The collision

A

must be elastic

B

may be partially elastici

C

must be completely inelastic

D

may be completely inelastic

Text Solution

Verified by Experts

The correct Answer is:
A
In hydrogen atom `E_(2)-E_(1)=10.2 eV`
Since,` " " 5 eV lt 10.2 eV`
The electron cannot excite the hydrogen atom. The collision must be therefore elastic .
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