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Author Topic: The universal teleporter?  (Read 1209 times)

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Offline swashy

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The universal teleporter?
« on: 01:42:12, 05 May, 2013 »
Forgive my ignorance  :embarrass:

Light is massless energy, or 'pure' energy right?  (that's why it can travel at the ultimate speed)

but Einsteins equation says that mass has energy, therefore energy must be able to be converted back into it's equivalent mass in a reverse process somehow? so can mass be transported at light speed in it's energy equivalent form?

Ade

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Offline g8ina

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Re: The universal teleporter?
« Reply #1 on: 10:23:27, 05 May, 2013 »
Waves, particles, quantum, wibble :)

Waves QI's "nobody knows" card ;)
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Offline MikeDunn

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Re: The universal teleporter?
« Reply #2 on: 10:36:16, 05 May, 2013 »
(that's why it can travel at the ultimate speed)
Well ... light-speed can be as slow as a few metres per second ...
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Offline mcgillca

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Re: The universal teleporter?
« Reply #3 on: 18:08:37, 05 May, 2013 »
Interesting question.

Einstein's equation E=mc^2 is only valid for a particle at rest. The full equation is:

E^2 = m^2c^4 + p^2+c^2

where p is the momentum (Energy squared is equal to mass squared + momentum squared).

A photon only has momentum (kinetic energy). Most particles have both mass energy and momentum. Reducing a particle's momentum can never reduce the energy below the mass energy.

So, without destroying the particle you can't convert it to pure energy. You could destroy it by making it meet an antiparticle, but then it would be the remnants of that collision which would likely include photons, which would travel at the speed of light, not the original particles.

Now of course, you just need sufficient quantum entanglement....

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Offline Bazzaar

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Re: The universal teleporter?
« Reply #4 on: 23:13:01, 05 May, 2013 »
So photons are NOT massless, otherwise they cant have momentum?

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Offline tomhow

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Re: The universal teleporter?
« Reply #5 on: 18:36:13, 06 May, 2013 »
I think you'd need quite a lot of photons, Ade.

Using E=mc2 I find that I contain 6x10^15 kJ of energy.

SO I need one of those nasty 1kW floodlights running for around 200 million years.

We all contain the potential for a lot of light pollution!

(apologies if my maths is out by an order of magnitude here and there, but you get the drift)



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