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Re: Time Paradox 4 Years, 5 Months ago
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Hypersonic -
My post isn't about theoretical limits. Why don't you buy a review book on physics before you make comments about a topic you don't understand!
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WttA5
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Posts: 1182
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Re: Time Paradox 4 Years, 5 Months ago
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[quote1197585896=Hypersonic]
[quote1197565601=Salix]
The theoretical limit is when an infinite amount of energy would be required to accelerate an object because the object has obtained an infinite mass...
[/quote1197565601]
Right. that's for all objects except for photons, which don't have any mass.
But photons travelling through any medium are slowed down (however slightly)...
Even the interstellar medium (vast near-vacuum plasma) slows light down a little bit.
In fact, there's nowhere in the universe that's a perfectly pure vacuum, so light never ACTUALLY travels at 299792458 metres per second, though often very very close....
[/quote1197585896]
I am not going to say that photons have mass or not, but this is interesting.... Sometimes people like to say that a photon does have mass because a photon has energy E = hf where h is Planck's constant and f is the frequency of the photon. Energy, they say, is equivalent to mass according to Einstein's famous formula E = mc2. They also say that a photon has momentum, and momentum p is related to mass m by p = mv.
This actually refers to relativistic mass, which is different than conventional mass.
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\"The results of philosophy are the uncovering of one or another piece of plain nonsense and of bumps that the understanding has got by running its head up against the limits of language. These bumps make us see the value of the discovery.\"
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Re: Time Paradox 4 Years, 5 Months ago
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Karma: 1
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[quote1197589517=nanrek]
Hypersonic -
My post isn't about theoretical limits. Why don't you buy a review book on physics before you make comments about a topic you don't understand!
[/quote1197589517]
Maybe I need to review physics, but that doesn't have anything to do with the fact that you claimed that photons travel at "this maximum speed" (of light).
That is false, and that's all I was saying.
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The kind of philosophy one chooses depends upon what kind of person one is. ~ J.G. Fichte
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Re: Time Paradox 4 Years, 5 Months ago
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Hypersonic -
Light always travels at c in any medium. Hight energy photons may appear to be slower from our perspective because of spacetime distortions.
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Salix
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Posts: 309
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Re: Time Paradox 4 Years, 5 Months ago
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WHAT?!?!?!
Lies. Light does slow down in mediums with a higher refractive index!
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If God had meant us to do philosophy, he would have created us.
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Re: Time Paradox 4 Years, 5 Months ago
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Light does not slow down in mediums! In reality, the speed of light never actually slows down. It is just delayed as the photons are absorbed and re-emitted by atoms in the intervening space. When a light beam exits a transparent medium into a vacuum, it continues traveling at the same rate as when it originally entered, without any added energy. This shows that slowdown is merely illusory.
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