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Just here to learn and share.


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
comment Classical mechanics and the speed of a train-mosquito collision, when perfectly rigid bodies
Did the mosquito buy a ticket? If not, this situation is impossible.
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.
Oct
23
awarded  Yearling
Sep
22
comment Matrix mechanics for those with wave mechanics background
Quantum Mechanics by R.L Liboff has some introductory Matrix Mechanics. It is an o.k but dated book for a first course in QM.