I read in !emc-pstc that Chris Maxwell <chris.maxw...@nettest.com> wrote (in <83d652574e7af740873674f9fc12dbaaf7e...@utexh1w2.gnnettest.com>) about 'Fiber optic cable testing per EN 55022:1998 ?' on Fri, 10 Jan 2003: >So where is the "crossover point"? Does it have to do with skin depth? Maybe >the photoelectric effect? Why don't we talk about photons at 1Ghz?
Pragmatically, because there is no need to. Radio astronomers probably find that their parsecage may vary. (;-) > Is it just >because we don't have a material with the correct band gap to produce a 1Ghz >photon? I don't know whether anything will work in a MASER at 1 GHz, but there is at 1.44 GHz, AIUI. Whether there could be an LED analogue working at much lower frequencies seems a good question. Electron energy transitions with low enough energies can occur between the outer shells of heavy atoms, but whether electron/hole recombinations can occur with such low energies is another matter.. > On the other hand, can free electrons be "conducted" at light >frequencies; or isn't there a material with enough of a skin depth at such >frequencies? The conduction need not necessarily be in a solid. > Anybody want to take a stab at enlightening(no pun intended) Oh, please intend it! > us >all on this one? Try sci.physics -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
