lightspeed

[Mercedes Benzene]

Originally Posted by goku

back-off buddy, i didn't know the speed of light, besides i like talking to people.

in my head? please, i'm a farmer

Please don't tell one of our staff members to "back off."
One of the things that we stress here (and something that has been stressed by various members in this thread already) is how important it is to be able to do research. If you didn't know the speed of light, it wouldn't take more than a quick Google search to figure it out.
Instead of people feeding you information, you would find it to be much more beneficial to derive this information yourself.

MB

[goku]

Originally Posted by Mercedes Benzene

Please don't tell one of our staff members to "back off."

nah i was just yankin his chain

[Pyrotex]

If your intention here is just to yank people's chains, perhaps you should go find another website where that is considered good clean fun.
Here, it is considered a rude waste of our time.

Pyrotex
another Moderator

[goku]

Originally Posted by Pyrotex

If your intention here is just to yank people's chains, perhaps you should go find another website where that is considered good clean fun.
Here, it is considered a rude waste of our time.

Pyrotex
another Moderator

it's either the way i word phrases or most people here are anti-social

waste of our time?
perhaps i fail to see the urgency and importance of time at this forum

[Pyrotex]

Originally Posted by goku

it's either the way i word phrases or most people here are anti-social...perhaps i fail to see the urgency and importance of time at this forum

Goku, we have read enough of your posts to know the problem.

You take pleasure in "yanking people's chains" as you say it.
We call that "being rude".

You fail to see the importance of time here because you do not expect to benefit from your time here--you have no intention of learning anything.
We call that "being a slacker".

You fail to take any measures to either say what you mean or mean what you say--and you don't care either way.
We call that "being a simpleton".

[Moontanman]

Originally Posted by goku

it's either the way i word phrases or most people here are anti-social

waste of our time?
perhaps i fail to see the urgency and importance of time at this forum

Goku, everyones time is important, I've sent significant hours searching for information and answers to your questions only to have to shrug them off like I was an idiot child. That behavior is antisocial, it's rude, and there is no reason for it.

[goku]

Originally Posted by Pyrotex

You take pleasure in "yanking people's chains" as you say it.
We call that "being rude".

i will try to refrain from "being rude" as you say it

[HydrogenBond]

Here is an interesting observation about the speed of light. If we take a mass and increase its velocity toward C, SR says the mass (relativistic mass) will increase toward infinity. But on the other hand, if we have a photon moving at C, forming a matter-antimatter pair, the system will go from C to less than C, while skipping over the infinite mass barrier. It is like a check valve that goes one way much easier.

[watcher]

Originally Posted by HydrogenBond

If we take a mass and increase its velocity toward C, SR says the mass (relativistic mass) will increase toward infinity. But on the other hand, if we have a photon moving at C, forming a matter-antimatter pair, the system will go from C to less than C, while skipping over the infinite mass barrier. It is like a check valve that goes one way much easier.

HB,
interesting. what specifically is this reverse flow that the check valve was supposed to stop ?

here is an interesting observation about the speed of light.

btw, the only observation i know about lightspeed is the emission of photon from one point and the absorption of the same photon from another point. no one i think have ever actually observed a cruising photon much the same way we observed an arrow cruising in space over a period of time. the so called c is just an extrapolation from the time the photon is emitted and absorbed between two points. i'm not sure if this is still the case today but im sure we already knew that photons jump.

i am thinking about if c is an absolute speed in its truest sense of the word or its constancy is just a postulate exclusively within the SR/GR theory. but since SG/GR are far from being the theory of everything, i am not sure if a constant c can hold out on its own. for instance there is no postulate i know of in QM that forbids faster than lightspeed neither C is an absolute exact value. maybe its constancy is a valuable tool in math to do relativity but my understanding is that everything in nature is infinitely divisible and therefore all values we can derived cannot be exact but will always be an approximation plus or minus to nth degree of accuracy.

so a photonic jump from an approximated position is space to another probable position in space cannot always have the same exact value for c. maybe it varies but the variation is so small it is not noticeable by our current capability to detect or so small that the theory of relativity can ignore it without much affects to the theory in general.

[CraigD]

Originally Posted by HydrogenBond

Here is an interesting observation about the speed of light. If we take a mass and increase its velocity toward C, SR says the mass (relativistic mass) will increase toward infinity. But on the other hand, if we have a photon moving at C, forming a matter-antimatter pair, the system will go from C to less than C, while skipping over the infinite mass barrier. It is like a check valve that goes one way much easier.

The second phenomenon you describe – pair production – is an interesting example of energy and momentum conserving conversion of mater to energy, but I’d describe the “check valve” as being easier to pass in the matter-to-energy direction, rather than the energy-to-matter direction you suggest.

A photon above the energy equivalent of twice the rest mass of a particle can become the particle and its antiparticle (eg: 250 EHz photon into an electron and positron). For these particles to ever be observed – in other words, for them to be real, rather than virtual – they must interact with other particles in a fairly extraordinary way, such as a close pass with an atomic nucleus or a black hole, or they will collide and annihilate with one another and convert back into a photon with the same momentum and energy as the original.

On the other hand, a particle and its antiparticle, having opposite charges, will, unless measures are taken to prevent it, promptly ”pair annihilate” into two or more photon (or, less commonly, other particles).