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A set of atom in an excited state decays...

A set of atom in an excited state decays

A

In general to any of the states with lower energy

B

Into a lower state only when excited by an external electric field

C

All together simultaneously into a lower state

D

To emit photons only when they collide

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The correct Answer is:
A
A set of atoms in an excited state decays in general to any of the states with lower energy.
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