Which phenomenon shows that quanta of light, or photons, exist?
A) Diffraction
B) Polarization
C) The photoelectric effect
D) Interference

Question

Quizplus · Accepted Answer

The photoelectric effect demonstrates the existence of photons, as it involves the emission of electrons from a material when light is shone upon it. This effect can only be explained by the particle nature of light, i.e., by light being made up of quanta or photons.

Which Phenomenon Shows That Quanta of Light, or Photons, Exist