----- Original Message ----- From: "Alberto Monteiro" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, June 15, 2002 10:35 AM Subject: Re: seeing through clothes
> > > >>The technology will detect an obscure yet ubiquitous > >>form of radiation known as terahertz waves, also called T-rays. > > > I wrote: > > > >Yawn. The fancy names those marketing guys invent to sell > >old stuff... AFAIK, these are either microwaves or infrared. > > > Hmmm... On a second thought, 1 terahertz is 10^12 cicles/second, > so the wavelength is c * second / 10^12 = 0.3 mm > > There seems to be some definitions of the spectrum that > avoid classifying those waves as microwaves or IR. > > From... > http://csep10.phys.utk.edu/astr162/lect/light/spectrum.html > > Microwaves are from 0.1 mm to 100 mm. Infrared are from 0.0007 mm > [red] to 0.1 mm. According to that site, you were right to begin with. 0.3 mm is between 0.1 mm and 100 mm. Unless you use PoMo math. :-) Dan M.
