Question

what are quanta of light called?

excitons

muons

charms

photons

Explanation:

• Excitons: These are bound states of an electron and an electron hole in a semiconductor. They are not quanta of light.
• Muons: These are elementary particles similar to electrons but with a higher mass. They are not related to light quanta.
• Charms: This is a property (a flavor) of quarks. It has no connection to light quanta.
• Photons: In physics, light is considered to be made up of discrete packets of energy called quanta. The quantum of electromagnetic radiation (which includes light) is called a photon.

Answer:

photons