A photon (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light') is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and …

May 24, 2025 · The answer, unveiled through the birth of quantum mechanics, is that light is composed of tiny packets of energy called photons. These quantum particles of light challenge …

Dec 14, 2022 · Learn about photons in physics. Get the photon definition and fun facts about this interesting unit of light.

Mar 10, 2022 · Photons are fundamental subatomic particles that carry the electromagnetic force — or, in simpler terms, they are light particles (and so much more). The photon is also the …

Jun 10, 2025 · A photon is the most basic, discrete packet of energy that light or any electromagnetic wave can exist in. It is an elementary particle with no mass and no electric …

Discover what a photon is and how it relates to light, energy, and atomic transitions. Learn how photons carry energy in discrete packets and play a role in emission spectra.

Oct 18, 2025 · photon, minute energy packet of electromagnetic radiation. The concept originated (1905) in Albert Einstein ’s explanation of the photoelectric effect, in which he proposed the …

Jun 27, 2024 · Photons represent the entire spectrum of electromagnetic radiation. This includes radio waves, gamma-rays, and visible light. Photons carry electromagnetic energy. This …

Jul 23, 2025 · When an electron in an atom transitions from a higher energy state to a lower energy state, it emits a photon with energy equal to the energy difference between the two states.

Nov 8, 2024 · What is a photon? A photon is a massless, elementary particle that is the fundamental unit of light and all other forms of electromagnetic radiation. Photons have neither …