Re: Simple Sagnac


"sue jahn" <susysewnshow@xxxxxxxxxxxx> wrote in message
news:42f4fc16$0$18646$14726298@xxxxxxxxxxxxxxxxxx
|
| "Androcles" <Androcles@ MyPlace.org> wrote in message
news:8F5Je.11771$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...

If ya don't like the Chinese, read the original paper with greek in it.
I'm not responsible for Usenet or 8-bit-Uuencode, whatever that is.


| > 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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