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 May 1 awarded Notable Question Aug 29 awarded Popular Question Feb 20 accepted Technical detail in the solution of the hydrogen atom Feb 20 comment Technical detail in the solution of the hydrogen atom Oh, thanks, I managed to solve the rest of the exercise after reading your comment! Feb 16 awarded Editor Feb 16 comment Technical detail in the solution of the hydrogen atom It's supposed to mean "the function that maps $\mathbf r$ to $\frac{1}{r}$" but I thought the exercise was being too pedantic with the notation so I edited the original post to remove it and make it clearer. Feb 16 revised Technical detail in the solution of the hydrogen atom deleted 7 characters in body Feb 16 accepted What is a photon's speed inside a dieletric? Feb 16 asked Technical detail in the solution of the hydrogen atom Feb 16 comment What is a photon's speed inside a dieletric? But from what I understand, an EM wave is a collection of zillions of "coherent" photons, which people generally explain to mean they are all "synched" (I'm not sure this is correct?). When a photon is absorbed by an atom, wouldn't it be later re-emitted at a random direction? And if all photons are being re-emitted at random directions, wouldn't this break the coherence and destroy the EM wave? Feb 13 comment What is a photon's speed inside a dieletric? @Qmechanic The top answer to that question simply says that the apparent speed of light is lower due to nebulous "interactions [of the photons] with the atoms of the materials". "Interactions" can be anything. Are we talking about collisions like in the Drude model? Or do the photons get absorbed, then re-irradiated? Or something else altogether? Feb 13 asked What is a photon's speed inside a dieletric? Feb 1 awarded Scholar Feb 1 accepted Amount of thermal energy in the Earth? Jan 23 comment Amount of thermal energy in the Earth? @joshphysics I thought about that, but I don't know how to calculate the mass of the mantle, outer core and inner core. I could use a state equation (we do know the volume, temperature and pressure) but I have zero idea what state equation to use for molten stuff under huge pressures and temperatures. Jan 22 asked Amount of thermal energy in the Earth? Jan 8 awarded Student Jan 8 asked How to construct the Hamiltonian matrix?