Re: [Phys-L] light, doppler effect, particles

[Bill Nettles <bnettles@uu.edu>]

Spacetime diagrams can be generated in LaTeX using the Tikz drawing package.  Tikz includes a transformation command in the options which matches John's matrix.

I have posted a sample LaTeX file at http://www.uu.edu/personal/bnettles/PhysL/RelDoppler.tex

The resulting PDF is at http://www.uu.edu/personal/bnettles/PhysL/RelDoppler.tex

With appropriate massaging of the LaTeX file you can generate whatever spacetime diagrams you want as PDF's very easily.

> -----Original Message-----
> From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of John Denker
> Sent: Tuesday, April 22, 2014 2:34 PM
> To: Phys-L@Phys-L.org
> Subject: Re: [Phys-L] light, doppler effect, particles
>
> It's fairly easy to visualize what's going on, by looking at the spacetime
> diagrams.  This is discussed, with diagrams,
> here:
>
>   http://www.av8n.com/physics/spacetime-welcome.htm#sec-doppler-1sd
>
> That is a newly-added section.  Let me know if you have questions,
> comments, or suggestions.
>
> Note:  For problems like this, I draw the red-frame diagram freehand, and
> then /compute/ the blue-frame diagram.  That way I know all the
> relationships are correct.  I've done this so many times I can do it in my sleep
> now.
>
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