Forumi Horizont Gjithsej 5 faqe: « 1 2 [3] 4 5 »
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- Fizikë dhe Astronomi (http://www.forumihorizont.com/forumdisplay.php3?forumid=10)
-- the world of physics and astronomy (http://www.forumihorizont.com/showthread.php3?threadid=10080)

Postuar nga Fizikanti datë 06 Dhjetor 2005 - 07:28:

Citim:
Po citoj ato që tha NS-6
well,keeping in mind that the closed space is still composed of other particles that will exchange these photons...great instability...the energy gathered will be extremely hard to controll...probably explosion at the end...am i right?

Well, assuming that photons are absorbed by the other materials (depending on material) then all the enrgy absorbed would translate into internal energy which would make the material reach high temperatures, meaning a breakdown of internal structure of material, solid changes to liquid then gas where the pressure would keep rising (since the space is closed and assuming is perfectly insulated, no energy losses) till force generated by the pressure would be bigger then the force used to hold this "closed" space together. At this point you could expect an explosion depending on how big the pressure build up is.
What if there is no material in this space? Vacum in which we add photons. Then the question would be; can photons interact with each other at high densities in the enclosed vacum?

Postuar nga NS-6 datë 07 Dhjetor 2005 - 03:41:

one moment here...where do these photons come from?and one more question: i have read that the empty space can be assumed as a space where matter appears and disappears...i mean an appearance and disappearance of matter and antimatter...if we consider this situation there will be an interaction...most probably i mean...otherwise i just dont have any idea by now...

Postuar nga Fizikanti datë 08 Dhjetor 2005 - 06:05:

Citim:
Po citoj ato që tha NS-6
one moment here...where do these photons come from?and one more question: i have read that the empty space can be assumed as a space where matter appears and disappears...i mean an appearance and disappearance of matter and antimatter...if we consider this situation there will be an interaction...most probably i mean...otherwise i just dont have any idea by now...

I know that today would be impossible to set up this experiment as it was mentioned previously it would be imposible for the photons not to be absorbed in the enclosed space. In this case we are trying to solve a "though experiment".
I also have read this prediction where matter and antimatter are formed from "nothing" or in vacuum. As far as I know this remains an unproven theory. A very interesting one that explain things that previously were not explain by any theory. I would like to draw your attention to this thought experiment only, what would happen if we keep adding photons to an enclosed vacuum space?

Postuar nga NS-6 datë 08 Dhjetor 2005 - 15:53:

as far as i know(and told me) photons do not interact with each other since they have no mass...i mean pachage of energy can not interact with each other.however i cant give any proven data on this "still remaining hypothesis for me"...so adding photons inside this empty vaccum space wont make any difference in terms of entropy(the system is isolated and no energy exchange with the outer space isn't it?),as the space is empty!!!
correct me if i'm wrong here!

Postuar nga NS-6 datë 09 Dhjetor 2005 - 04:38:

Citim:
Po citoj ato që tha Fizikanti

As far as I know this remains an unproven theory...

i read smth yesterday about this...in medicine there is a type of machine used in radiology,called PET (positron emmiting tomography),a last generation one i must say that uses this thing...photons with an energy greater than 1.02 MeV are trasformed into an electron and a positron which are captured by the machine and based on that trasforms the information gathered in an image...this phenomenon is called "effetto coppia" in italian...
this is what i have read!

Postuar nga Fizikanti datë 10 Dhjetor 2005 - 03:25:

I have posted this in another forum and got some interesting answers.
Photons would interact with each other if we were to have such conditions.
An example of this sort of photon-photon interaction is the creation of e+ e- (electron/positron) pairs out of the vacuum. If you put enough photons in a box, you'll exceed the Schwinger critical field, and you'll start to see electron-positron pair production in the box. So the pressure will rise and the box will eventually explode.
So that was the answer of the original question by darke. I hope you understand it.
Basically we start with massless particles and end up generating mass in the enclosed vacuum till presure rises beyond critical point.
Here is a link to other views regarding the question.
http://www.physicsforums.com/showthread.php?t=103186

Postuar nga NS-6 datë 10 Dhjetor 2005 - 04:20:

wowww...the discussion seemed really long there ...
ok!!!coming up with another question:
gravity!in which conditions it can be repulsive and (just in case),what is known about its nature?
i've heard physicians find it difficult to include it in the main formulas.

fizikanti,thanks for the patience and the time u spend to write these informations here...and forgive us if the questions have any problem!

Postuar nga Fizikanti datë 13 Dhjetor 2005 - 00:11:

NS6, it is a pleasure helping country man that are here to learn and engage in discussions. I have read some papers on antigravity, most recently from a russian scientist (Yevgeny Podkletnov) who promisses to have discovered the secret of antigravity. Not a lot of people have taken seriously his claims because has yet to dublicate the results of his first experiment. There are some new theories that look promising, like dipole anti-gravity (http://tachyonics.com/) and "Big spin" anti-gravity (http://www.antigravity.org/). The discovery of the anti-gravity will change our lives forever. Hope that it happens in our life time, we might get a chance to step on the moon and mars after all.

Postuar nga kontinenti datë 17 Dhjetor 2005 - 22:23:

SHume bukur, por, perse e shkruani ne anglisht? Po ata qe nuk dine anglisht, nuk kane te drejte te mesojne ide te reja, apo zbulime te reja, per teori te aprovuara e jo te aprovuara, gravitet e anti gravitet etj.
Kush ju detryron te shkruani ne anglisht?

Postuar nga NS-6 datë 18 Dhjetor 2005 - 05:51:

ket teme ketu e kam hapur me qellim qe darke te mund te merrte ndonje informacion sepse me kishte qelluar shpesh te flisja me te dhe te me pyeste per pune fizike dhe mjeksie...ashtu sic bera edhe tek mjeksia,bera edhe ketu...sidoqofte nese ke ndonje gje fare mire mund te hapim nje teme ose te kapim nje teme nga ato qe jane hap edhe pyet aty dhe shpresoj se do marresh pergjigje!zgjidh nje teme konte edhe fillojme e diskutojme andej,por ne kete teme do flitet ne anglisht per shkak te darkes!shpresoj se me kupton!
shnet!
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