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awarded  Explainer
Sep
13
answered How similar is comparison between the principle behind Newton's Cradle versus AC Current moving down a transmission line?
Sep
7
awarded  Critic
Sep
7
comment Lightspeed (invariance) measurement methods
The very first determination of the speed of light by Rømer did not need mirrors.
Sep
7
comment Special Relativity, 2nd Postulate — Why?
Thank you; I've corrected the spelling errors (and improved some formulations).
Sep
7
revised Special Relativity, 2nd Postulate — Why?
Last paragraph: corrected spelling, improved formulation
Sep
7
answered Special Relativity, 2nd Postulate — Why?
Sep
7
answered Riemann curvature tensor notation in Wald
Sep
7
comment Do we weigh less in the morning?
"During the night, the sun is above us, and the earth below us." I think you mean: "During the day, the sun is above us ..."
Sep
6
comment Can entanglements themselves be entangled?
Most importantly, entanglement is not a relation in the mathematical sense because in general, particles can be entangled in inequivalent ways. That is, there is not only "entangled" and "not entangled", there are different inequivalent ways in which particles can be entangled. Systems consisting of just two systems which have just two states each (that is, two qubits) are special in that regard, since they are the only system that shows only one type of entanglement. Indeed, in the case of more than two particles, there's even no longer an unique maximally entangled state.
Sep
6
answered Can entanglements themselves be entangled?
Sep
6
answered Can we multiply an electromagnetic field?
Aug
31
revised Can someone please qualitatively explain unitary group from a physics perspective?
fixed O(3) → SO(3)
Aug
31
answered Can someone please qualitatively explain unitary group from a physics perspective?
Aug
13
answered What is the physical meaning of commutators in quantum mechanics?
Aug
13
answered Are there two theories that are mathematically identical but ontologically different?
Aug
9
comment Finding the mass of pure matter
I've deleted my comment, since it no longer applies to the current version of the answer.
Aug
2
comment Why do physical bodies in the universe follow the law of physics ( or any rule/pattern ) ?
Wouldn't that be more appropriate for Philosophy.SE? Anyway, if physical objects would never follow any rules, then the same would also be true for the physical objects making up our brains (or rather, then not making up our brains, because forming brains also requires following rules), and thus there would be nobody there to observe the universe.
Aug
2
comment What does the $y$-axis represent in the atomic spectra and what is its significance?
"Actually a color CCD will report three numbers" — there is no such thing as a colour CCD. Rather to determine colour with CCDs, you put a colour filter in front of it. For a spectral analyser you wouldn't want to do that because the position already tells you everything about the frequency, so any filter would not add any information.
Aug
2
comment How to measure Entropy?
@Phonon: But if held at that standard, wouldn't a classic thermometer also not measure temperature, since the measured quantity ultimately is the volume of the mercury in it?