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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 when excited by an ex-ternal electric field

C

all to gether simultaneously into a lower staet

D

to emit photon only when they collides

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