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

Tardigrade Admin · Accepted Answer

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.

Q. A set of atoms in an excited state decays

in general to any of the states with lower energy

into a lower state only when excited by an external electric field

all together simultaneously into a lower state

to emit photons only when they collide

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.