On Jan 17, 2013, at 11:23 AM, retired mainframer <[email protected]> wrote:
> Don't both > electricity and light move at c? In a vacuum, light moves at c. In a fiber optic cable, you divide c by the index of refraction. That's usually in the range of 1.5, so the light is traveling about (2/3)c. The speed of electrical signals is a bit more complicated. It's been almost 30 years since I took electromagnetism so I'm not going to try to explain it; I'm sure I'd get it wrong. It will be less than c too, though. -- Curtis Pew ([email protected]) ITS Systems Core The University of Texas at Austin ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
