From: adam@address.invalid   
      
   unruh wrote:   
   > Since by definition, RF is Radio Frequency which is defined as below   
   > about 1GHz, at which point you get microwaves. But if you mean "is   
   > electromagnetic transmission in those ranges infrared or visible light"   
   > then yes. And just as radio oscillators produce radio waves, laser   
   > oscillators produce IR and visible light. Same thing, different   
   > frequencies.   
      
   Thank you for a clear explanation that answers my question!  I gather   
   the term I should have been using is "electromagnetic radiation" or EMR   
   because RF implies a specific range of frequencies.   
      
   >>> Which I suppose excludes them as RF transmission ranges, unless light is   
   >>> allowable.  Would frequencies significantly higher than those be usable?   
   >   
   > Useable for what? Xrays are used by your doctor all the time.   
      
   My apologies for my unclear wording.  What I meant was whether they're   
   usable for transmitting data in the same way that MHz frequencies are   
   used, either in theory or in any "real world" application.  X-rays are   
   indeed useful but not what I was thinking of.   
      
   >>>   I've forgotten what I learned in college "freshman physics", mainly   
   >>> because the course was horrible.  It was one factor in my decision to   
   >>> leave that university, even though I wasn't a physics major.   
   >   
   > Too bad you gave up the chance to learn because of a bad experience. I   
   > hope you replaced it with some other means.   
      
   I understand why you're saying that and I'm in sympathy with you.  I   
   didn't give up on education; I just concluded that a large research   
   university is not the best place for an undergraduate.   
      
   Next I went to a well-known liberal arts college (where the faculty were   
   there because they wanted to teach undergrads) and earned a B.A. there   
   (well, technically an A.B.).  That was followed by an unsuccessful   
   attempt at grad school (wrong field for me, also personal problems), and   
   then earning an M.S. from a local college which IMHO wasn't up to   
   offering graduate degrees but at that point I was more interested in the   
   degree (and career prospects) than in learning.  For the past few years,   
   I've been a non-matriculated student at the local community (public   
   junior) college, taking one three-credit course most semesters (for   
   credit and a grade) in whatever looks interesting at the time, no degree   
   plans there.   
      
   That's about 25 semesters (2 incomplete) spent (or started) in   
   post-secondary education so far, and the next one starts in two months.   
   :-)  I can name the schools (all in the U.S.) if you're curious, but I   
   think my feelings about the "bad" university and the "good" liberal arts   
   college would apply to many other comparable institutions.   
      
   Adam   
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