Which of the following gives rise to the line spectra obtained from atoms?

A. Kinetic energy of a moving atom
B. Potential energy of an electron inside an atom
C. Change of an electron from a higher to a lower energy level in the atom
D. Disturbed proton in the nucleus
E. Excitation of an electron in the atom

Correct Answer:

Option C – Change of an electron from a higher to a lower energy level in the atom