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An electron of kinetic enregy K collides...

An electron of kinetic enregy K collides elastically with a stationary hydrogen atom is the ground state. Then,

A

`K gt 13.6 eV`

B

`K gt 10.2 eV`

C

`K lt 10.2 eV`

D

data insufficient

Text Solution

Verified by Experts

The correct Answer is:
C
For `Kge10.2 eV` electrons can excite the hydrogen
atom `(as E_2 - E_10.2 eV).` So, collision may be
inelastic.
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