Re: thought experiment

From: Theo Wollenleben (alpha0x89_at_yahoo.de)
Date: 08/30/04 

Date: Mon, 30 Aug 2004 12:41:06 +0200

On Mon, 30 Aug 2004 00:02:09 +0200, Ruud Lustig <rlustig@casema.nl> wrote:

> I have a question about the speed of light.
> As I understand time stops at the speed of light. And... a photon travels
> with the speed of light.

[snipped long winded gedanken experiment]

> My question is: How does that match the tranformation equations? When
> Alice
> measures time between my passages of the two stars, Bob's time cannot
> have
> stopped completely. Or can it??

Time dilatation formula: t' = sqrt(1-(v/c)^2)*t = 0 for v = c. So Alice
messures time t and you messure time t' = 0. The tranformation equations
give the right answer.