meta user
network profile
| bio | website | |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 1 year, 11 months |
| seen | Aug 22 '11 at 23:59 | |
| stats | profile views | 33 |
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Aug 3 |
answered | Where the angular momentum has gone? |
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Aug 3 |
revised |
How beam focusing looks like in electron microscope? appended 5 paragraphs |
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Aug 2 |
revised |
How beam focusing looks like in electron microscope? corrected screen -> lens |
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Aug 2 |
answered | How beam focusing looks like in electron microscope? |
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Jul 29 |
awarded | Commentator |
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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. |
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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. |
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Jul 28 |
revised |
Trying to understand the EPR paradox corrected names |
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Jul 28 |
revised |
Trying to understand the EPR paradox added two paragraphs |
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Jul 28 |
answered | Trying to understand the EPR paradox |
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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 |
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Jul 26 |
comment |
How does electron gun accelerates electrons? @dmckee: many meters of weak field outside, a few millimeters of strong field inside |
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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. |
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Jul 26 |
answered | How does electron gun accelerates electrons? |
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Jul 14 |
revised |
How come an anti-reflective coating makes glass *more* transparent? Added one paragraph |
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Jul 13 |
answered | How come an anti-reflective coating makes glass *more* transparent? |
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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. |
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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. |
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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. |
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Jul 6 |
answered | Why aren't there compression waves in electromagnetic fields? |
