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i saw this, is it true?
http://forums.govteen.com/showpost.php?p=2494738&postcount=23
http://forums.govteen.com/showpost.php?p=2494738&postcount=23
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CJames said:As far as I know, the appearance of virtual particles is allowed because of the Heisenburgh uncertainty principle where energy in relation to time just so happens to be the same units as momentum in relation to position. So energy can appear for a short moment so long as it is in a short enough timeline because it is not actually detectable.
I don't think that the Planck time allows for particles to travel faster than light though. Hmm, have to look it up.
___ said:but, isn't it true that particles can travel fster than light in Plancks time(which cannot be measured)?
ubiqer said:When people say speed of light what wavelength do they use to measure this?
Am i wrong in thinking that red light is slower than blue?
are there then higher resolution particles that would then be faster?
don't neutrinos travel through all matter are they say any faster than a green photon?
questions from a novice
many thanks
Neutrinos are neutral leptons so they don't interact via the strong nuclear force or the electromagnetic force. They only interact throught the weak nuclear force and gravity now that we found they have a very, very small mass. So for traveling through material, we will disregard gravitational interactions, the cross section for the neutrino (just think of it as the probability of the neutrino to interact with something) to interact with some amount of matter is much smaller than the cross section of a photon to interact with the same matter. Traveling through matter faster than light is not unheard of. Contrary to what you may think this does not contradict Special Relativity. This is still assuming that neutrinos actually do travel faster than light in a certain medium (I am not sure that they do).ubiqer said:don't neutrinos travel through all matter are they say any faster than a green photon?
questions from a novice
many thanks
marlon said:I would say this is a bad choice of words.Macro said:I say the EM inetecation of charged particles with light is what causes matter to slow light's speed.
Matter resists light by its EM field.
Light is NOT slowed down when it passes through a medium. The photon velocity is always c. The only thing that happens is when light passes through a medium, photons get absorbed by the medium's atoms. After emission, photons travel on with speed c until they get absorbed again. The net effect is that light takes more time to pass through a medium, thus it SEEMS to have slowed down.
The famous analogy in this case is the one of a car with constant velocity, traveling from A to B with 3 red lights in between, that has to stop three times because of red-lights. Though the velocity is constant, the car will take more time to travel from A to B.
marlon
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Virtual particles are particles that exist for a very short amount of time, on the order of 10^-24 seconds. They are not directly observable, but their effects can be detected through their interactions with other particles.
Virtual particles are created when energy is borrowed from the vacuum of space. This energy then spontaneously converts into a pair of particles and antiparticles, which almost immediately annihilate each other.
Virtual particles are considered to be real in the sense that they have measurable effects on physical phenomena. However, they do not have the same properties as particles that we normally think of, such as mass and charge.
Virtual particles cannot be observed directly, but their effects can be observed through various phenomena, such as the Casimir effect and Hawking radiation.
No, virtual particles and dark matter are two different concepts. Virtual particles exist for a very short amount of time, while dark matter is a hypothetical form of matter that is thought to make up a large portion of the universe's mass.