Re: thought experiment

From: Dirk Van de moortel (dirkvandemoortel_at_ThankS-NO-SperM.hotmail.com)
Date: 08/30/04 

Date: Mon, 30 Aug 2004 12:51:50 +0200

"Theo Wollenleben" <alpha0x89@yahoo.de> wrote in message news:opsdjjystwldawh6@quercus.physik.uni-halle.de...
> 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.

Time dilation formula:
    t' = t / sqrt(1-v^2/c^2) for events satisfying x = 0,
i.o.w. for events taking place on Alice's clock itself.
So Alice measures t on her clock and for these
events you would measure time t' = infinity.

Dirk Vdm

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