Are photons quantized?

Answer 1

The word "light" is defined here as "electromagnetic radiation of any wavelength"; thus, X-rays, gamma rays, ultraviolet light, microwaves, radio waves, and visible light are all forms of light.
Photon

Photons emitted in a coherent beam from a laser
Composition: Elementary particle
Family: Boson
Group: Gauge boson
Interaction: Electromagnetic
Theorized: Albert Einstein (1905–17)
Symbol: or
Mass: 0
Mean lifetime: Stable[1]
Electric charge: 0
Spin: 1
In modern physics, the photon is the elementary particle responsible for electromagnetic phenomena. It mediates electromagnetic interactions and makes up all forms of light. The photon has zero invariant mass and travels at the constant speed c, the speed of light in empty space. However, in the presence of matter, a photon can be slowed or even absorbed, transferring energy and momentum proportional to its frequency. Like all quanta, the photon has both wave and particle properties; it exhibits wave–particle duality.

The modern concept of the photon was developed gradually (1905–17) by Albert Einstein[2][3][4][5] to explain experimental observations that did not fit the classical wave model of light. In particular, the photon model accounted for the frequency dependence of light's energy, and explained the ability of matter and radiation to be in thermal equilibrium. Other physicists sought to explain these anomalous observations by semiclassical models, in which light is still described by Maxwell's equations but the material objects that emit and absorb light are quantized. Although these semiclassical models contributed to the development of quantum mechanics, further experiments proved Einstein's hypothesis that light itself is quantized; the quanta of light are photons.

Answer 2

A photon, by definition, is a quanta of light energy. That is why the concept of a photon is very useful in describing the "particle-like" behaviour of light.

Bozo

Answer 3

Yes, indeed