My Optics lecturer said something about how since light travels in a vacuum, you could, potentially, have something Travel faster in a different medium, one other than a vacuum.
True or false?
It has been done. Get something traveling in a vacuum just below the speed of light, and then whack it into a medium where it is now traveling at faster thant he speed of light in that medium. The particles that have had this done to them, slow down dramatically, and radiate their previous energy – its called Cerenkov radiation. So , yes – particles can exceed the speed of light, if they are in some medium other than a vacuum, but not for very long.
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#1 by Riley on August 4, 2010 - 9:53 pm
true
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#2 by Night visions on August 4, 2010 - 10:08 pm
theres always something new to find out so i wouldnt say false.
besides humans dont know everything.
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#3 by Tom on August 4, 2010 - 10:35 pm
If that medium bends time then yes
but u wouldnt need to with artificial gravity field
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#4 by Andrei S on August 4, 2010 - 10:40 pm
true a simple thought in your brain can travel faster than the speed of light
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knowledge
#5 by Dan B on August 4, 2010 - 10:56 pm
I would have to say false. Light is known to slow down anytime it enters a medium other than a vacuum. A vacuum offers no resistance to light.
But here’s a concept. Light is traveling toward you at the speed of light. You are traveling toward the light source at the speed of light. Therefore, you are traveling at twice the speed of light relative to the light traveling in the opposite direction you are traveling – relativity theory.
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#6 by Mack the Finger on August 4, 2010 - 11:24 pm
I find this extremely difficult to swallow, honestly. As any entity’s density increases as it approaches light-speed, it’s hard to believe anything could (given our current understanding) possibly travel any faster. As you approach this cosmological speed limit, an INFINITE amount of energy becomes necessary to shatter this barrier because, as you become increasingly heavier as your size contracts (Lorenz Factor), increasingly more energy is needed to push you, first, to the barrier and, then, past it.
I may perhaps be ignorant of some critical information but what I’ve provided above is, in a nutshell, the very problem most physicists quote in rebuke of the possibility of Warp Speed, as it were.
Hope it helps.
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#7 by rex on August 4, 2010 - 11:36 pm
It has been done. Get something traveling in a vacuum just below the speed of light, and then whack it into a medium where it is now traveling at faster thant he speed of light in that medium. The particles that have had this done to them, slow down dramatically, and radiate their previous energy – its called Cerenkov radiation. So , yes – particles can exceed the speed of light, if they are in some medium other than a vacuum, but not for very long.
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Old teacher