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An electron of the kinetic energy 10 eV ...

An electron of the kinetic energy `10 eV` collides with a hydrogen atom in `1st` excited state. Assuming loss of kinetic energy in the collision be to quantized which of the following statements is correct?

A

The collision may be perfectly inelastic

B

The collision may be inelastic

C

The collision may be elastic

D

The collision must be inelastic

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