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Re: [Phys-l] (no subject)




The sun does it for lite space craft.

bc



On 2011, Feb 27, , at 17:49, carmelo@pacific.net.sg wrote:

How about can you move a mirror on the floor with the photons emitted
from your torchlight? Let's not ignore friction which exists in the
real world.
Radiometer is not massive too. :-)

Quoting Bernard Cleyet <bernardcleyet@redshift.com>:

Now I'm puzzled.

Photons have momentum, so I'd think the mirror would absorb some of
the momentum and result in a frequency shift on the photon. Not
measurable because of the disparity in momenta. OTOH, how about the
radiometer? The "real" one, not the fake ones that depend on a
little gas in the bulb.

bc


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