Old 10-31-2007, 06:59 PM   #181
Rhinoqulous
The Original Rhinoqurilla
 
Rhinoqulous's Avatar
 
Join Date: Apr 2005
Location: Somewhere Not-So-Cold with Mountains
Posts: 4,829
Good points OCM, I'm about to watch the new South Park and then go out and get me my drink on. I'll respond tomorrow.

Wait just a minute-You expect me to believe-That all this misbehaving-Grew from one enchanted tree? And helpless to fight it-We should all be satisfied-With this magical explanation-For why the living die-And why it's hard to be a decent human being - David Bazan
Rhinoqulous is offline   Reply With Quote
Old 11-01-2007, 07:56 PM   #182
Sternwallow
I Live Here
 
Sternwallow's Avatar
 
Join Date: Feb 2005
Posts: 23,211
Quote:
Choobus wrote View Post
Energy and momentum do not imply rest mass. Photons move at the speed of light, and it is impossible for anything with mass to move at the the speed of light, but at the same time it is clear that photons have energy. It is the rest mass you have to consider.

The proper time (tp) experienced by any observer depends on their speed. In SR it is tp = INT [sqrt{1-(g^2)}] dt, where g = v/c. Clearly if v = c, g = 0 and tp = 0 as well. (see here for more details). Photons do NOT age. There are no slow photons. When people talk about slowing light down they don't slow down an actual photon, they put light into a BEC or a "photonic" crystal or something and the group velocity is reduced . It's in no way a violation of SR.
OK, gotcha, thanks for your patient and illuminating explanations.
BTW, if g = v/c and v = c, isn't g = 1?

"Those who most loudly proclaim their honesty are least likely to possess it."
"Atheism: rejecting all absurdity." S.H.
"Reality, the God alternative"
Sternwallow is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -7. The time now is 11:39 PM.


Powered by: vBulletin - Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright © 2000 - , Raving Atheists [dot] com frequency-supranational frequency-supranational