Activity
Paul Dirac revised idea #5828.
Light’s energy comes in packets, quanta, each with an energy proportional to the light’s frequency, so bluer light has more energetic quanta. Each quantum is taken up whole, by one electron.
Light is a quantum field. Its energy comes in quanta, photons, each taken up whole at one place. But the chance of finding a photon here or there spreads and interferes like a wave: each photon interferes only with itself. So light makes interference stripes and knocks out electrons alike.