In Stephen Blundell's "Concepts in Thermal Physics" chapter 4 he derives the Boltzmann distribution. The equation that leads to the Taylor expansion is the following: $$P_s(\epsilon) \propto \Omega(E-\epsilon)$$ where $P_s(\epsilon)$ is the probability of a system in thermal equilibrium with a re...

Had scientists ever managed to fire/detect single, individual particles, photons/electrons/etc., before the photoelectric effect was discovered and Einstein's work on it saying that light also acted like a particle? I'm just confused because if they were able to fire and detect single photons/par...

I understand why microwaves penetrate flesh, it has been answered before here, but in the most answers it was mentioned that although microwaves have less energy per photon when compared to visible light, at high intensities only do they penetrate and even visible light would, but at the same tim...

I was reading Introduction to Quantum Mechanics by David Griffiths and I am at Chapter 2, page 45. He says that The general solution to the time-dependent Schrodinger equation is still a linear combination of separable solutions (only this time it's an integral over the continuous variable $k$, ...