L'énergie du photon : d'où vient-elle, si la lumière n'a pas de masse ?

The Energy of the Photon: Where Does It Come From, If Light Has No Mass? | For Sleep Where does the energy of a photon come from, if it has no rest mass, no internal parts, and no hidden fuel? A calming documentary, designed to help you fall asleep, about what light truly is. We follow light at a leisurely pace, from Faraday's lines of force to Maxwell's equations, then from Planck's quantum hypothesis to Einstein's explanation of the photoelectric effect. You'll understand why a photon isn't a tiny, shiny ball, but a quantized excitation of the electromagnetic field, whose energy depends entirely on its frequency. We'll also see how photons are born in atomic transitions, in the fusion at the heart of stars, and even in the annihilation between matter and antimatter. A serene exploration of the photon's energy, its momentum, and why light can heat, react, propel, and reveal the universe. #Photon #PhotonEnergy #QuantumPhysics