Published by:
CGP EDU Academic Team
Published on: August 22, 2026
A particle of mass 
collides with a hydrogen atom at rest. Soon after the collision the particle comes to rest, and the atom recoils and goes to its first excited state. The initial kinetic energy of the particle (in eV) is 
. The value of 
is:
(Given the mass of the hydrogen atom to be 
)
Text Solution
Verified by ExpertsThe correct answer is:
51
(51)
loss in 
so 
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