A set of atoms in an excited state decays.

Question:

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

Solution:

(a) in general to any of the states with lower energy

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