I am trying to better understand the logic behind the famed 1887 Michelson-Morley experiment...and want to comprehend what they EXPECTED to see. As I understand it, the motivation behind this experimental setup was, under the initial assumption that the Aether existed, to detect differences of tr...

In the Ising model, mean field approximation consists in writing each spin $S_i$ as a fluctuation around its average value and neglect this fluctuation: \begin{equation} S_i=\overline S +\delta S_i \quad \text{with}\quad |\delta S_i| \ll |\overline S| \end{equation} where the average value can be...

The Planck-Einstein relation E=hf for photon can be extended for any other particle. Describing total energy this way feels relatively intuitive for photon, at least partly because we have easily understandable experimental results. Is there any easy explanation/ intuition why total energy of any...

During the introductory class on Hamiltonian mechanics after we had learnt the Lagrangian formalism, our professor said "We cannot use Lagrangian mechanics to find the state of a system at any particular instant (he did not give any explanation), so that is why we use Hamiltonian mechanics." Bu...