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A set of atoms in an excited state decay...

A set of atoms 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.

Text Solution

Verified by Experts

The correct Answer is:
A
in general to any of the states with lower energy.
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