Assertion (A) : Atoms of each element are stable and emit characteristic spectrum. Reason (R) : The spectrum provides useful information about the atomic spectrum.

A and R are both true and R is the correct explanation of A. A and R are both true but R is NOT the correct explanation of A. A is true but R is false. A is false but R is true.

A and R are both true but R is NOT the correct explanation of A.

Emitted spectrum is due to the transition of electrons from higher energy states to lower ones.