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Jul
10
comment Canonical everyday-life example of a technology that could not work without humans mastering QM in analogy to the application of GR in GPS?
I think this applies to semiconductor devices in general (including integrated circuits such as the ones used to type this message)
Mar
27
comment Which units has the relation $E=mc^2$?
I guess you mean $10^{17}\mathrm{m^2/s^2}$
Mar
9
answered The orthogonalized plane waves
Mar
9
comment The orthogonalized plane waves
I guess the $d\tau''$ in the integral should be a $dr''$
Feb
26
comment Why is gravity so hard to unify with the other 3 fundamental forces?
Quantum Gravity is non-renormalizable, see e.g. physics.stackexchange.com/q/3901/671 for what that means
Feb
23
comment Does a Photon leave trace in a silicon tracker?
Yes, I also saw in various places that the probability of photoelectric absorption seems to go with 1/E^3 (where E is the photon energy) while at higher energies one has to think in terms of radiation length as you say. By the way, the CMS detector (ATLAS' direct competitor) actually uses a laser of 1075nm wavelength (i.e. 1.15 eV) to shoot on the silicon tracker where they are detected to monitor the alignment of the different parts of the tracker (see e.g. page 79 of iopscience.iop.org/1748-0221/3/08/S08004)
Feb
22
comment Does a Photon leave trace in a silicon tracker?
that does not really answer why for example photons can be detected in avalanche photo diodes (or photo diodes in general) or Silicon photomultipliers
Feb
22
comment Strong decays of baryons via quark-antiquark pairs
there are two known decay modes, see pdg.lbl.gov/2012/listings/rpp2012-list-xicc-plus.pdf
Feb
21
revised Once I have the eigenvalues and the eigenvectors, how do I find the eigenfunctions?
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Feb
21
answered Once I have the eigenvalues and the eigenvectors, how do I find the eigenfunctions?
Feb
18
answered Collision of two photons
Feb
18
comment Collision of two photons
see also physics.stackexchange.com/questions/1361/… . They used terawatt pulses of laser light to experimentally demonstrate light by light scattering.
Feb
16
comment Radiation exposure to a child who was briefly in the presence of an adult who had received a 18FDG PET scan
also less than the dose absorbed during a transatlantic flight ($7\cdot10^{-5} $ Sievert) according to this source
Feb
14
answered Trilinear gauge couplings: Spin
Feb
14
comment At what depth in the water atmospheric pressure is 100 times greater than on the ground?
the keyword is hydrostatic pressure
Feb
14
comment At what depth in the water atmospheric pressure is 100 times greater than on the ground?
to be picky, at the surface, you already have one atmosphere of pressure, so one should add/subtract that (and you'll get about 9.81m less depth)...
Feb
13
revised Muon production in particle accelerator
added 69 characters in body
Feb
13
answered Muon production in particle accelerator
Feb
11
answered Why do astronomers never put a scale on their photographs?
Feb
11
answered What would happen if Large Hadron Collider would collide electrons?