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.
Correct Answer: A
Solution :
Option [a] is correct. Explanation: A set of atoms in an excited state decays in general to any of the states with lower energy.You need to login to perform this action.
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