An electron with K.E. $6 e V$ is incident on a hydrogen atom in its ground state.The collision :

must be elastic

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may be partially elastic

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must be completly inelastic

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may be partially inelastic

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Solution

The correct option is D must be elastic
$6 e V$ is less than energy required to excite hydrogen atom and hence there should not be any energy loss or transition. Hence the collision will be purely elastic.

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An electron with K.E. 6eV is incident on a hydrogen atom in its ground state.The collision :

The correct option is D must be elastic6eV is less than energy required to excite hydrogen atom and hence there should not be any energy loss or transition. Hence the collision will be purely elastic.

An electron with K.E. $6 e V$ is incident on a hydrogen atom in its ground state.The collision :

The correct option is D must be elastic
$6 e V$ is less than energy required to excite hydrogen atom and hence there should not be any energy loss or transition. Hence the collision will be purely elastic.