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seen Aug 22 '11 at 23:59

Aug
3
answered Where the angular momentum has gone?
Aug
3
revised How beam focusing looks like in electron microscope?
appended 5 paragraphs
Aug
2
revised How beam focusing looks like in electron microscope?
corrected screen -> lens
Aug
2
answered How beam focusing looks like in electron microscope?
Jul
29
awarded  Commentator
Jul
29
comment Trying to understand the EPR paradox
So isn't the quote from Wikipedia clearly incorrect? By the way, I have not said that you can transfer information instantaneously using entangled particles.
Jul
29
comment Trying to understand the EPR paradox
@Olof: Here Wikipedia erroneously says that Alice's measurement turns Bob's measurement into lottery: You might imagine that, when Bob measures the x-spin of his positron, he would get an answer with absolute certainty, since prior to this he hasn't disturbed his particle at all. But Bob's positron has a 50% probability of producing +x and a 50% probability of -x—so the outcome is not certain. Bob's positron "knows" that Alice's electron has been measured, and its z-spin detected, and hence B's z-spin calculated, so its x-spin is uncertain.
Jul
28
revised Trying to understand the EPR paradox
corrected names
Jul
28
revised Trying to understand the EPR paradox
added two paragraphs
Jul
28
answered Trying to understand the EPR paradox
Jul
27
comment How does electron gun accelerates electrons?
@dmckee: this articles says that no, you can not use lined up charged capacitors as a particle accelerator: link
Jul
26
comment How does electron gun accelerates electrons?
@dmckee: many meters of weak field outside, a few millimeters of strong field inside
Jul
26
comment How does electron gun accelerates electrons?
@Ben Crowell Electron that is shot from a far away position towards the negative plate of a parallel plate capacitor, loses 3 electron-volts of energy when traveling towards the negative plate, gains 6 electron-volts of energy when traveling between the plates, and loses 3 electron-volts of energy when traveling away from the positive plate. Energy loss must be equal to energy gain, and it must be symmetric. So exactly half of gained energy is lost when electron travels from positive plate to infinity.
Jul
26
answered How does electron gun accelerates electrons?
Jul
14
revised How come an anti-reflective coating makes glass *more* transparent?
Added one paragraph
Jul
13
answered How come an anti-reflective coating makes glass *more* transparent?
Jul
8
comment Understanding Heat
@leftaroundabout I don't believe that sound is low frequency sound while heat is high frequency sound. It's more like heat is energy while sound is momentum.
Jul
8
comment Understanding Heat
@Edgar Bonet: Well, I think the question was "why is it that sound is fast while heat is slow". And I think my answer is the least error ridden one. Well that's what I think. Now, a really good answer would explain why sound is fast, not just why heat is slow.
Jul
7
comment Understanding Heat
Well my view is that conduction of heat in solids resembles conduction of heat in gases, much more than conduction of heat in solids resembles propagation of sound in gases or solids.
Jul
6
answered Why aren't there compression waves in electromagnetic fields?