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

[Jeffrey Schnick <JSchnick@Anselm.Edu>]

I can't point you there but Doppler cooling takes advantage of the facts that you point out.  See:
http://en.wikipedia.org/wiki/Doppler_cooling 

> -----Original Message-----
> From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of Philip Keller
> Sent: Tuesday, April 22, 2014 11:41 AM
> To: Phys-L@phys-l.org
> Subject: [Phys-L] light, doppler effect, particles
>
> A student asked me a question I need some help with.
>
> Suppose you have a source of light that is just below the threshold frequency
> for a given metal surface.  You get no photocurrent.
>
> Now suppose the source is approaching at some speed great enough so that
> the Doppler effect shifts the frequency to a value above the threshold.
>  Now you do get photocurrent, yes?
>
> Suppose an observer riding with the source uses a beam splitter so that half
> the light approaches you and gets Doppler shifted to give you that photo
> current but the other half goes to the ride-along observer.  He does not get a
> photo current...right?
>
> I'm not even sure what my question is.  Can anyone point me to a photon-
> based treatment of the doppler effect?
>
> Thanks,
> Phil
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