Discrete wavelengths of light are emitted by an excited gas because
A) the speed of light is constant in a given medium.
B) light can behave either as a wave or as a particle.
C) electron energy levels are quantized.
D) the intensity of radiation is proportional to the second power of the frequency.

Question

Quizplus · Accepted Answer

Electron energy levels in atoms are quantized, meaning electrons can only occupy specific energy levels. When an electron transitions from a higher energy level to a lower one, it emits a photon of light with a wavelength corresponding to the energy difference between those levels. This results in the emission of light at discrete wavelengths.

Discrete Wavelengths of Light Are Emitted by an Excited Gas