Like I understand light is photons. But from whence the photons? How come if I’m in a dark room (by the way, why is the room dark? Why no photons in the room?) and I turn on a flashlight, suddenly there’s photons everywhere?
In: Physics
Firstly, the room is dark because the photons that were previously in the room have collided with the walls. When this happens, the energy is transformed from light into heat, so the wall gets a little hotter and the room darker. Light moves crazy fast, so it all collides with the walls very promptly, so unless there is a continuous input of new photons, you get darkness
When you turn on a flashlight, the energy stored in the batteries (in chemical form) is transformed into light, basically spewing out a stream of photons
You can use these photons to see because they fly out of the torch, bounce off objects, then fly into your eyes.
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