Re: [Phys-l] (no subject)

[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




On 2011, Feb 25, , at 17:14, carmelo@pacific.net.sg wrote:

> Quoting Bob Sciamanda <treborsci@verizon.net>:
>
> > My point was simply semantic:  What do you mean by "unstoppable"?
> >
> > 1) It can experience the largest force and not have its velocity changed.
> > or
> > 2) It experiences no forces.
>
> "Unstoppable" may have another meaning in mirror reflection.
>
> 3) It can experience force with its velocity reversed.
>
> Sometimes, the problems of semantics should be explained to the students.
> It depends on how we idealize the notions of "unstoppable" and "unmovable".
>
>
> Alphonsus
>
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