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A free electron of energy 1.4 eV collide...

A free electron of energy `1.4 eV` collides with a `H^(+)` ions. As a result of collision, a hydrogen atom in the ground state is formed and a photon is released. What is the wavelength of the emitted radiation ? In which part of the electromagnetic spectrum does this spectrum lie ? Give ionisation potential of hydrogen `=13.6 eV`

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