Published by:
CGP EDU Academic Team
Published on: August 12, 2026
An electron with 
collides with hydrogen atom in ground state. The collision is observed to be elastic for
A
B
Only 
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
For elastic collision to take place there must be no loss in the energy of electron. The hydrogen atom in ground state will absorb energy from colliding electron only if it can go from ground state to 
excited state 
for this atom requires energy 
.
So if electron possesses energy less than 
, it would never loose it & hence collision would be elastic.
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