What gives rise to the line spectra observed in atoms?

Physics

NECO 2001

A. change of an electron from a higher to a lower energy level in the atom
B. disturbed protons in the nucleus
C. excitation of an electron in the atom
D. kinetic energy of a moving atom
E. potential energy of an electron inside an atom

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Correct Answer: Option A

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What gives rise to the line spectra observed in atoms?

Correct Answer: Option A

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