Explain how line spectrum accounts for existence of discrete energy levels in an atom. 

Explain how line spectrum accounts for existence of discrete energy levels in an atom.

Atoms of a particular element emit radiation with definite frequencies or wavelengths. When an atom is in excited state, and an electron may fall into a vacant position in lower energy level is accompanied by emission of electromagnetic radiation with the characteristic E= hf;

Where E is the difference in the energy of involved energy level and h is Plank’s constant. Since the frequencies are definite for a particular element, it implies that the energy levels are discrete.

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