>>11426474As a undergrad physicist a decent chunk through his coursework:
I have no fucking idea.
Here's how far I understand it:
Experiments that involve a photon's 'particleness' give a result that says light is a particle. Photoelectric effect , blackbody radiation, ect. could only work if light came in discrete, individual chunks - like a particle.
Meanwhile, experiments that test a photon's 'waviness' show that the photon is a wave. Polarization, double slit experiment, etc. only work if light is a wave.
It's not one or the other, either:
Lasers rely on excited atoms being stimulated into emitting a photon with a specific energy. The photon then, because of the design of the laser, ends up being focused and coherent with the other individual photons, meaning that their waves match up.
I remember the explanation being "light is a wave-packet", with different waves of different momentums adding together to cancel out everywhere except around a general position (aka if you know the speed, you don't know the position. If you know the posistion, you don't know the speed).
So that's the bare minimum physics explanation.
