fophillips
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 Aug 9 comment Validity of a steady state solution of reaction-diffusion equation @alarge No, mass is not conserved. Stochiometric coefficients are used to calculate relative yield of biomass as a function of food/O2/whatever. As I understand it, this is justified by saying we are only concerned with the reactions that affect the visible concentrations of food and biomass, and the rest of the mass is used in other reactions we are not concerned with. But yes, we have to solve for both phenomena in the same time step regardless. Aug 1 asked Validity of a steady state solution of reaction-diffusion equation Jul 3 awarded Popular Question Dec 8 awarded Commentator Nov 11 awarded Yearling May 20 accepted The units of gain and number of atoms in population inversion in a laser May 20 revised The units of gain and number of atoms in population inversion in a laser Added tags May 20 asked The units of gain and number of atoms in population inversion in a laser May 13 comment Stark Effect on the 1st excited state of Hydrogen Is the selection rule $\Delta m = 0$ for the integral? May 13 comment Stark Effect on the 1st excited state of Hydrogen Excellent, thanks! May 13 accepted Stark Effect on the 1st excited state of Hydrogen May 13 comment Stark Effect on the 1st excited state of Hydrogen That's a useful overview, but I think I need a slightly more rigorous approach. Don't feel obliged to do it yourself, but do you know of any resources which would be helpful? May 13 asked Stark Effect on the 1st excited state of Hydrogen May 4 awarded Student Dec 4 awarded Caucus Nov 29 awarded Scholar Nov 29 accepted Which pion is mediator in nucleon-nucleon interaction Nov 29 asked Which pion is mediator in nucleon-nucleon interaction Nov 16 comment Particles vs Waves A particle is described by its wavefunction, a probability amplitude describing its quantum state. When a system is observed the wavefunction "collapses" into a sharply peaked function at some point, which appears to be like a classical particle. Then again Quantum Field Theory sort of renders the difference between the two moot. Nov 15 comment Particles vs Waves But individual particles have been shown to behave like waves. Performing the double slit experiment one photon at a time shows this.