And I believe Adm. Hopper would have been thinking in terms of signal speed, since that is what is relavent in terms on computers.
At Mon, 4 Nov 2024 12:56:17 -0600 William Prescott <w...@theprescotts.com> wrote: > > I should have read more carefully before replying. Are you (Michael) > responding to the electron speed or the signal speed. The signal travels much > faster than an individual electron. The analogy I read was to think of a tube > filled with marbles moving through it. A marble drops out of the end much > faster than it takes for one marble to traverse the entire tube. > > Will > > On 4 Nov 2024, at 12:09, Stephen M. Butler <kg...@arrl.net> wrote: > > On 11/4/24 08:26, William Prescott wrote: > > Electrons move very slowly in copper, about 1 cm/sec. The question is the > > signal speed in copper, which is about half the speed of light. I got this > > from a couple > I think you are missing a decimal point and a few zeros between said point > and the 1. The velocity factor of wire is between 0.80 - 0.95. (80-95%)That > implies a slowdown of 5-20% -- not the near 100% that would get to 1 cm/sec. > Taking the 80% factor and the 11.8" calculated below would give a length > around 9" -- which is the length I remember getting when attending a lecture > for (then) Capt Grace Hopper. > > On 4 Nov 2024, at 10:00, Michael or Penny Novack via > > gnucash-user<gnucash-user@gnucash.org> wrote: > > > > On 11/4/2024 10:45 AM, Robert Heller wrote: > >> The Speed of Light = 299 792 458 m / s > >> Nano =0^-9 > >> > >> 299792458 * 10^-9 )97924580m = 29.9792458000cm = 11.8028526771in > >> > > Excuse me, but that is in a vacuum. Would be slower in some other medium > > (like that length of fiber). And while electrons can approach the speed of > > light in a vacuum, they move slower in that copper wire. > > > > For example, the reason a prism bends light is that the speed of light in > > glass is lower than in air. > > > > Michael D Novack > > > > > > _______________________________________________ > > gnucash-user mailing list > > gnucash-user@gnucash.org > > To update your subscription preferences or to unsubscribe: > > https://lists.gnucash.org/mailman/listinfo/gnucash-user > > ----- > > Please remember to CC this list on all your replies. > > You can do this by using Reply-To-List or Reply-All. > > > > _______________________________________________ > > gnucash-user mailing list > > gnucash-user@gnucash.org > > To update your subscription preferences or to unsubscribe: > > https://lists.gnucash.org/mailman/listinfo/gnucash-user > > ----- > > Please remember to CC this list on all your replies. > > You can do this by using Reply-To-List or Reply-All. > _______________________________________________ > gnucash-user mailing list > gnucash-user@gnucash.org <mailto:gnucash-user@gnucash.org> > To update your subscription preferences or to unsubscribe: > https://lists.gnucash.org/mailman/listinfo/gnucash-user > ----- > Please remember to CC this list on all your replies. > You can do this by using Reply-To-List or Reply-All. > > _______________________________________________ > gnucash-user mailing list > gnucash-user@gnucash.org > To update your subscription preferences or to unsubscribe: > https://lists.gnucash.org/mailman/listinfo/gnucash-user > ----- > Please remember to CC this list on all your replies. > You can do this by using Reply-To-List or Reply-All. > > > -- Robert Heller -- Cell: 413-658-7953 GV: 978-633-5364 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services hel...@deepsoft.com -- Webhosting Services _______________________________________________ gnucash-user mailing list gnucash-user@gnucash.org To update your subscription preferences or to unsubscribe: https://lists.gnucash.org/mailman/listinfo/gnucash-user ----- Please remember to CC this list on all your replies. You can do this by using Reply-To-List or Reply-All.
