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-----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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