Date: Wed, 26 Oct 2005 22:23:09 +0200

Author: Urs Lauterburg

Subject: Re: radiometer

Post:

Sam,

I think we have discussed that before here on tap-l, years ago though....

This is not feasible because the radiation pressure of light is a
magnitude smaller than any impacts due to moving molecules in a gas.
I think it would be mostly impossible to overcome any mechanical
friction but then again maybe some day somebody will be able to come
up with a REAL radiometer. It would be a really nice demo!

For now I guess the best is to go to outer space with a sail which
works because of the lack of friction.

Happy demoing.... I just started the winter semester here and am
moving sliders on airtracks detecting displacement with my nifty
laser distance sensor I like so much to use for this 1D-motion
tracking stuff. It's the most elegant way to do it I think.

Urs


>Anybody evacuate an electrometer and shine light on it to show the
>momentum of light? Is this possible with these simple radiometers,
>or do you need more elaborate apparatus?
>
>Thanks,
>
>Sam
From dodds@rice.edu Wed Oct 26 16:24:42 2005

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