Assuming that the mass of proton is nearly equal to mass of neutron the minimum kinetic energy in 10 1 eV of a neutron for inelastic head on collision with a ground state hydrogen atom at rest is –
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(20)
Let 
speed of neutron before collision
speed of neutron after collision
speed of hydrogen atom after collision
energy of excitation from conservation of momentum
from conservation of energy
from (i) and (ii)
As 
must be real
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