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 Dec 23 answered Is the superposition principle universal? Dec 16 revised When can photon field amplitudes be written as field operators? added 61 characters in body Dec 15 awarded Promoter Dec 15 comment Wavelength comparison of two waves @vulcanraven, if so you have to look for a material that selectively absorbs XRays and not Gamma rays or you need a high energy prism or, a high energy interference filter. This is how we handle frequency separation in the optical domain. I have no idea if such things exist in the high energy regime. Dec 14 comment Wavelength comparison of two waves What are the wavelengths you are interested in? Do you want to separate the wavelengths or actually measure them? Dec 13 comment What causes the back of a bike to lift when the front brake is applied? Suppose you stand up adiabatically, where does the PE come from? Granted that one cannot really do this adiabatically as friction with the road etc will slow you down. Dec 13 revised What causes the back of a bike to lift when the front brake is applied? added 75 characters in body Dec 13 answered What causes the back of a bike to lift when the front brake is applied? Dec 13 awarded Citizen Patrol Dec 12 comment Tried to do the double slit experiment, failed. Why? Expand the beam with a lens. As long as you have one laser source, the fluctuations in intensity are correlated and you should have an easier time than with an incoherent source. Dec 12 comment Poisson brackets: prove that they are canonical invariants I like this answer, can you please point me to a reference which talks about the definition of a canonical transformation you mentioned (i.e I being symplectic)? I would give you 100 points of my rep if I knew how! Dec 11 comment How do I properly use Newton's Third Law and Free Body Diagrams? My first suggestion would be: Draw the coordinate system! Then, write the forces in vector form (this makes everything unambiguous). Dec 11 answered Optical equivalent of a superconductor Dec 11 asked When can photon field amplitudes be written as field operators? Dec 6 answered Simplest interferometer Dec 6 comment About the complex nature of the wave function? Removed the downvote by adding a +1. I found this post informative and detailed and I don't really care if it precisely answered the original question or not. Nov 27 comment Spectrum of quantum fluctuations in a harmonic oscillator Vladimir, first you need to calculate the variance of the operator in whatever basis you are working in to get a measure of fluctuation or noise. The RMS value is given as $\sqrt{\langle\hat{O}^2\rangle-\langle\hat{O}\rangle^2}$. Nov 27 awarded Caucus Oct 31 answered What ways are there to measure the local polarization of a laser beam? Oct 31 comment Zero Point Fluctuations The average energy is zero, but the variance need not be zero.