Light is an emmision molecule that spreads in waves.
Photon is unit of angular momentum transfer.4w- Fundamentally apparent fact of nature is that when an atom absorbs a photon, the atomic orbital angular momentum must change discretely and precisely with respect to whatever photon impinges on and becomes absorbed by the atom's discretely tuned, radially and circumferentially, spectrum of available absorborption frequencies and available import directions, as a function of the atom's (superposition) angular state. And inversely, in photon emission by atom.4w
- Light is what we perceive when photons stimulate our retina, and darkness is what we perceive when they don't. In the objective world, there is neither light nor darkness. We use "light" colloquially when we say the sun emits light. It emits radiation. Physicists call it "light" because that's how we perceive the radiation, and the colloquial term is easier to use. And a "dark" room isn't really dark. When you turn on the light in a dark room, what happens to the darkness? Does the light drive it away? The darkness was never there. It was in your mind.4w
- +David Chako I'm going to find a big thick physics book so I might begin to understand this. 🤔4w
- +Richard Andrews At root, it is derivable via quantum mechanics' so-called "selection rules", one iron firm one being that atomic angular momentum must change, i.e., that the final state transitioned to after absorbing a photon must differ in it's angular momentum from the prior state. And vice-versa for photon emission.4w
- Since photons must eventually arrive somewhere, the inference of photon as unit of angular momentum transfer is logically immediate.4w
Light is all I have known. I have often wondered what people born blind at birth dream about. My understanding is so biased by visible light.4w
Yes it is3w
