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A neutron of kinetic energy 65 eV collid...

A neutron of kinetic energy 65 eV collides inelastically with a singly ionised helium atom at rest. It is scattered at an angle `90^@` with respect to original direction. If the energy of scattered neutron is 6.36 eV, find the frequency of emitted radiation from the helium atom after suffering collision.

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`9.85xx10^15` Hz
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