Question
Physics Question on Atoms
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
Answer
in general to any of the states with lower energy
Explanation
Solution
A set of atoms in an excited state decays in general to any of the states with lower energy which is more stable than the excited state.