Re: Simple Sagnac


"Androcles" <Androcles@ MyPlace.org> wrote in message news:8F5Je.11771$ia4.7564@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
snip
> Did you have a point to make?
> Maybe this is what's bothering you.
>
> "Another proof, more closely related to the present discussion, may be
> made by the following modification of a demonstration due to Langevin.
> Consider a source which is at rest with respect to an observer O and
> which radiates a simultaneous, oppositely directed pair of equal quanta,
> hu, e.g., annihilation radiation. While the total energy radiated is ?E
> = 2hu, the total momentum radiated is zero, so the source remains at
> rest with respect to O.
>
> Now, consider this phenomenon from the point of view of an observer O'
> who moves with respect to O with the constant velocity v = bc along the
> line defined by the radiation. On account of the first-order Doppler
> effect O' observes two quanta with the frequencies hu (1 + b) and hu
> (1 - b). He thus concludes that a net amount of momentum hu(1+b)/c - hu
> (1-b)/c = 2hub/c is emitted in the direction in which the source and O
> appear to move with respect to him. From the conservation principle for
> momentum he concludes that the source loses this same quantity of
> momentum. Now the velocity of the source with respect to O' does not
> change since it remains at rest with respect to O, as has been seen.
> Thus O' is forced to conclude that the mass of the source has decreased
> by an amount Dm, where (Dm)u = 2hub/c. Thus, Dm = DE/c2." J.G.Fox.

Eh! Freight charges across the channel are high.
Freight charges from China are higher.
If ya don't like it then start a cottage industry in hu manufacture.

Sue...

>
> Androcles
>
>
>
>
> | >
> | > | http://physics.nist.gov/cuu/Images/alphaeq.gif <----ignored
> unopened.
> | > |
> | > | There are no funny clocks in that tho' which I believe
> | > | is the gist of your gyrations.
> | >
> | > | Sue...
> | >
> | > There are no funny clocks. <---- see the period?
> | > Let's try this again.
> | > Sue doesn't need to tell Androcles about funny clocks.
> | > There are no funny clocks[period]
> | > My gyrations are intended to show that there can be no
> | > funny clocks. Funny clocks are proposed by others and
> | > I'm having my fun shooting them down. Not from the hip.
> | > I take careful aim. Both hands on the rifle, telescopic sights
> | > aimed on the target. Don't walk in front of me when I pull
> | > the trigger, or you'll be accidentally shot, and don't tell
> | > me my aim is off you'll be deliberately shot.:-)
> | Yikes! A threat. I'm tellin' Tony.
> | ... On second tho't, I wouldn't wish your phast fotons on
> | the physics community of even the roguest of states. :o)
> |
> | Sue...
> |
> | > Androcles
> |
>


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