Hello Paul!

25 May 05 17:34, Paul Rogers wrote to Herman Trivilino:

 HT>> colleagues at MIT.  Parcels of light, photons, do not
 HT>> possess mass, but a beam of light does carry momentum.  In
 HT>> general, when light strikes a mirror, the mirror will
 HT>> recoil ever so slightly, and this recoil has previously
 HT>> been measured.  But what about a single photon striking a

 PR> Well there must be SOME explanation for radiometers.

Yes, but there are two types of "light mills". Most mills you see
turn into the direction of the reflecting side of their wings (as if a
force would be pressing against the dark side), which clearly shows that
they're not moving because of the momentum transferred by impact of
photons.  Those serving as radiometers turn the other way round (and their
built-up is thus different).


Regards,
Gerrit

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