👉 Light particles, or photons, are fundamental entities that constitute electromagnetic radiation, including visible light. These particles are massless and travel at the speed of light in a vacuum, approximately 299,792 kilometers per second. Photons are created when energy is emitted or absorbed in discrete packets, a concept central to quantum mechanics. They carry energy proportional to their frequency, as described by Planck's equation (E = hν), where E is energy, h is Planck's constant, and ν is the frequency of the light. Photons interact with matter through processes like absorption, emission, reflection, and refraction, playing crucial roles in phenomena such as photosynthesis, vision, and the functioning of optical devices. Despite their lack of mass, photons exhibit wave-particle duality, behaving both as particles and waves depending on the experimental context.