Ne mogu da shvatim teoriju relativiteta...

Shadowed:
Ono sto mene interesuje je u stvari koliki je put koji prelazi onaj brat koji je otputovao do te neke zvezde gledano sa njegove tacke gledista.

zzzz:
Za početak:Majkelsonovi ogledi,zatim mjerenja pri pojavi Doplerovog efekta
učvrstili su uvjerenje da je brzina svjetlosti u vakumu maksimalno
moguća,i da veća ne može biti.

<snip>

Mišljenja sam da se ovdje pravi ključna greška!
KOJA JE TO GREŠKA?

<snip>

Dakle brzine se sabiraju!

zzzz:
Vidim ima oko 200 čitanja , a 0 odgovora.Zašto?

-Pri relativnom približavanju izvora svjetlosti prijemniku brzinom
v ,frekvencija poraste :f(1)=f(0)*(c+v)/c.Nema se tu čemu prigo-
voriti.

KOJA JE TO GREŠKA?
Mislim da treba uzeti u račun sledeće.Dok svjetlost po izlasku
iz rešetke dođe do zastora, i sam zastor putuje brzinom v u
susret , tako da je stvarni put kraći.Kad se pažljivo izračuna
onaj ugao ispada da se valna dužina uopšte nije promjenila.
Odatle slijedi: c(1)=f(1)*l(0)=c+v
Dakle brzine se sabiraju!

zzzz:
Da osvježim malo ovu temu.

Ima li ko zainteresovan da mu objasnim zašto ova teorija ne vrijedi.Mogu objasniti gdje je greška nastala i kako su stvari tekle u pogrešnom smjeru.Sve je vrlo logično
, lako razumljivo.Teoretski (matematika) i eksperimentalno se slaže.

Ovo nije za one koji ovu teoriju prihvataju kao dogmu , već za one koji pošteno
kažu da je ne shvataju jer je sama sebi protivrječna.

f(1)=f(0)*(c+v)/c

Kažu da se astronomi ne mogu načuditi zašto pulsari
(objekti u galaksiji) svakih 6 mjeseci mjenjaju frekvenciju
od max. do min. i to za 0.02%
(c=300 000 km/s , a obodna brzina Zemlje oko Sunca
v=30 km/s)

Michelson calculated that an aether windspeed of only one or two miles a second would have observable effects in this experiment, so if the aether windspeed was comparable to the earth's speed in orbit around the sun, it would be easy to see. In fact, nothing was observed. The light intensity did not vary at all. Some time later, the experiment was redesigned so that an aether wind caused by the earth's daily rotation could be detected. Again, nothing was seen. Finally, Michelson wondered if the aether was somehow getting stuck to the earth, like the air in a below-decks cabin on a ship, so he redid the experiment on top of a high mountain in California. Again, no aether wind was observed. It was difficult to believe that the aether in the immediate vicinity of the earth was stuck to it and moving with it, because light rays from stars would deflect as they went from the moving faraway aether to the local stuck aether.
The only possible conclusion from this series of very difficult experiments was that the whole concept of an all-pervading aether was wrong from the start. Michelson was very reluctant to think along these lines. In fact, new theoretical insight into the nature of light had arisen in the 1860s from the brilliant theoretical work of Maxwell, who had written down a set of equations describing how electric and magnetic fields can give rise to each other. He had discovered that his equations predicted there could be waves made up of electric and magnetic fields, and the speed of these waves, deduced from experiments on how these fields link together, would be 186,300 miles per second. This is, of course, the speed of light, so it is natural to assume that light is made up of fast-varying electric and magnetic fields. But this leads to a big problem: Maxwell's equations predict a definite speed for light, and it is the speed found by measurements. But what is the speed to be measured relative to? The whole point of bringing in the aether was to give a picture for light resembling the one we understand for sound, compressional waves in a medium. The speed of sound through air is measured relative to air. If the wind is blowing towards you from the source of sound, you will hear the sound sooner. If there isn't an aether, though, this analogy doesn't hold up. So what does light travel at 186,300 miles per second relative to?
There is another obvious possibility, which is called the emitter theory---the light travels at 186,300 miles per second relative to the source of the light. The analogy here is between light emitted by a source and bullets emitted by a machine gun. The bullets come out at a definite speed (called the muzzle velocity) relative to the barrel of the gun. If the gun is mounted on the front of a tank, which is moving forward, and the gun is pointing forward, then relative to the ground the bullets are moving faster than they would if shot from a tank at rest. The simplest way to test the emitter theory of light, then, is to measure the speed of light emitted in the forward direction by a flashlight moving in the forward direction, and see if it exceeds the known speed of light by an amount equal to the speed of the flashlight. Actually, this kind of direct test of the emitter theory only became experimentally feasible in the nineteen-sixties. It is now possible to produce particles, called neutral pions, which decay each one in a little explosion, emitting a flash of light. It is also possible to have these pions moving forward at 185,000 miles per second when they self destruct, and to catch the light emitted in the forward direction, and clock its speed. It is found that, despite the expected boost from being emitted by a very fast source, the light from the little explosions is going forward at the usual speed of 186,300 miles per second. In the last century, the emitter theory was rejected because it was thought the appearance of certain astronomical phenomena, such as double stars, where two stars rotate around each other, would be affected. Those arguments have since been criticized, but the pion test is unambiguous. The definitive experiment was carried out by Alvager et al., Physics Letters 12, 260 (1964)

A zanimljivo je da drugu pretpostavku da brzina svetlosti zavisi od izvora nisu mogli da obore sve do 1964. godine!!! Tek je tada izveden eksperiment koji je i tu mogucnost oborio.

Cini mi se da je drugi postulat prvobitne Ajnstajnove teorije relativnosti (kasnije je dopunjavao i nazvana je opsta teorija relativnosti, to jos nisam ucio :) ) koji glasi da je brzina svetlosti najveca brzina u prirodi oborena pre par meseci kada je izracunato da je brzina gravitacije negde oko 1,17c.