Photon

Discrete bundle of light energy. Light of a given energy (frequency) cannot be broken up indefinitely. Rather for a given frequency it comes in discrete bundles with energy (h = Planck’s constant and ν= frequency):

It is often useful to think of light as a bunch of particle photons; whereas, at other times it is useful to think of light as a wavePropagating disturbance which transmits energy from one point to another without physically transporting the oscillating quantity. A wave is characterized by wavelength and frequency.. This is termed the “wave-particle dualityPrinciple of quantum mechanics implying that light (and, indeed, all other subatomic particles) sometimes acts like a wave, and sometime acts like a particle, depending on the experiment being performed. For instance, low frequency electromagnetic radiation tends to act more like a wave than a particle; high frequency electromagnetic radiation.” The idea of the photon was advanced by Albert Einstein in his theory of the photoelectric effect.