atoms Question 2
Question: Q. 2. 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.
[NCERT Exemplar]
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Solution:
Ans. Correct option : (a)
Explanation : A set of atoms in an excited state decays in general to any of the states with lower energy.
