classes:2009:fall:phys4101.001:q_a_1123
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| classes:2009:fall:phys4101.001:q_a_1123 [2009/11/23 21:51] – yk | classes:2009:fall:phys4101.001:q_a_1123 [2009/11/28 22:18] (current) – ely |
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| Cathode ray tubes (http://en.wikipedia.org/wiki/Cathode_ray) are pretty standard for creating electron beams. There is plenty of information out there on them if you are curious. | Cathode ray tubes (http://en.wikipedia.org/wiki/Cathode_ray) are pretty standard for creating electron beams. There is plenty of information out there on them if you are curious. |
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| | == Zeno 11/25 9am == |
| | I knew there was something obvious that I was overlooking. Thanks! |
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| ====John Galt 11/23 5:35 PM==== | ===David Hilbert's Hat 11/25 12:30pm=== |
| Does anyone see anything useful coming from taking the time derivative of A(t) and B(t) as described in class and setting it equal to zero? In a magnetic field, will there ever be a time period over which the probability of finding a particle spin up or spin down will not change at all? | As far as I know they actually cooked silver atoms from a furnace. Wikipedia mentions that you need to have particles with a total electric charge of zero because otherwise they would deflect under the influence of a magnetic field before coming out of the apparatus - http://en.wikipedia.org/wiki/Stern-Gerlach seems to suggest that anything with a total neutral charge and unpaired electrons orbiting it can be used. If I recall correctly there is a pretty lengthy description of it in the 2000 level quantum book. |
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| | ===David Hilbert's Hat 11/25 1pm=== |
| | Also http://hyperphysics.phy-astr.gsu.edu/Hbase/spin.html seems to have a few extra details about the silver atoms. |
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| | ===Dark Helmet 11/28 10:15=== |
| | I don't know if it is exactly the same thing, but a free-electron laser would be a beam of electrons. Or is that a laser made from accelerating electrons? Now i can't remember. Well, anyway, an electron beam wouldn't be perfectly precise even in a perfect vaccuum due to the uncertainty in the beam width. Another one of those uncertaintly principle relations |
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classes/2009/fall/phys4101.001/q_a_1123.1259034685.txt.gz · Last modified: 2009/11/23 21:51 by yk