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A free hydrogen atom in ground state is ...

A free hydrogen atom in ground state is at rest. A neutron of kinetic energy K collides with the hydrogen atom. After collision hydrogen atom emits two photons in succession one of which has energy 2.55eV. Assume that the hydrogen atom and neutron has same mass.
(1) Minimum value of K is 25.5eV
(2) Minimum value of K is 12.75 eV
(3) The other photon has energy 10.2eV
(4) The upper energy level is of excitation energy 12.5 eV

A

Minimum value of K is 25.5 eV

B

Minimum value of K is 12.75 eV

C

The other photon has energy 10.2 eV

D

The upper energy level is of excitation energy 12.75 eV

Text Solution

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The correct Answer is:
A, C, D
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