A single unit of light energy.
The smallest quantity of electro magnetic energy; a particle with no mass and no charge; may occur in the form of x-rays, gamma rays, or quanta of light.
An individual packet or particle of electromagnetic radiation.
A light quantum or unit of energy of a light ray or other form of radiant energy. It is generally considered to be a discrete particle having zero mass, no electric charge, and indefinitely long life.
A quantum, or a fundamental unit, of electromagnetic radiation encompasses various forms such as light photons, x-rays, gamma rays, or radio waves. Additionally, an alternative term that refers specifically to x-rays is employed within this context.