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OfflineSeussA
Error: divide byzero


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Re: When a star explodes, the shockwave moves faster than the local speed of light? [Re: Cepheus]
    #7780337 - 12/20/07 03:10 AM (16 years, 1 month ago)

> m = (m0 / (1-(v^2/c^2)^(1/2))

So what is the mass (m0) of a photon, again?


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Invisiblefreakygurl
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Re: When a star explodes, the shockwave moves faster than the local speed of light? *DELETED* [Re: Seuss]
    #7780353 - 12/20/07 03:20 AM (16 years, 1 month ago)

Post deleted by freakygurl

Reason for deletion: .



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OfflineCepheus
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Re: When a star explodes, the shockwave moves faster than the local speed of light? [Re: freakygurl]
    #7780539 - 12/20/07 06:30 AM (16 years, 1 month ago)

I posed this question to my physics teacher when we briefly touched on relativity:
I said; If a photon is a particle, then surely it has mass?
to which he replied; no, its a wave.
then I counter-retorted with; electrons have mass, but they can act as waves.. so can they travel at the speed of light?
To which he just smiled :shrug:

Also; photons have energy, E=hf, and the likes. Einstein's energy-mass equivalence states that energy is directly proportional to mass, E=mc^2... and if a photon has Energy (therefore mass) it must also have momentum (p=mv).

Just some early morning physics to start my day, I enjoy these kind of discussions :laugh:


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"I only ever hope to reach equilibrium, in Nature's matrix, in line with the meridian" ~ Jehst

:sun: "...and I know that I have to keep breathing, as tomorrow the sun will rise, who knows what the tide will bring?" :sun:

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InvisibleDieCommie


Registered: 12/11/03
Posts: 29,258
Re: When a star explodes, the shockwave moves faster than the local speed of light? [Re: Cepheus]
    #7781279 - 12/20/07 11:43 AM (16 years, 1 month ago)

.


Edited by DieCommie (01/28/14 08:40 AM)


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OfflineSeussA
Error: divide byzero


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Re: When a star explodes, the shockwave moves faster than the local speed of light? [Re: DieCommie]
    #7781305 - 12/20/07 11:51 AM (16 years, 1 month ago)

Good read, thanks.  :smile:


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OfflineAnnom
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Re: When a star explodes, the shockwave moves faster than the local speed of light? [Re: DieCommie]
    #7782434 - 12/20/07 05:12 PM (16 years, 1 month ago)

Yes! Good read!

About trendals question:
The local speed of light can be 'used' to slow down light. Bose-Einstein condensate was discovered to bring down the local speed of light to 20 m/s, in 1999 [source]
We are probably able to completely stop light[link], which would be very useful in (computer)communication and storage.

This is all about the local speed of light and doesn't violate relativity.

I don't know how this works and I don't know how a shock wave would travel through a Bose-Einstein condensate.
I think a shock wave can travel faster than the local speed of light (constant c doesn't change), not sure how that works in an exploding star :smile:

Let us know if you get a reply.


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Offlinenobhdy
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Re: When a star explodes, the shockwave moves faster than the local speed of light? [Re: PhanTomCat]
    #7783140 - 12/20/07 08:07 PM (16 years, 1 month ago)

Quote:

PhanTomCat said:
Quote:

ToTheSummit said:
Although it is true that a photon born at the center of a star can take millenia to reach the surface and escape the star, my understanding is that this is due to the erratic course taken by said photon.  In otherwords, the photon is still travelling at the "normal" speed for light, but its interaction with other particles causes a zig-zag path that may be a thousand light years long before its exit from the star.  When a star explodes the shock wave does not exceed the speed of those photons, it just takes a direct path outward sweeping up everything in its path (including the photons).




Awww DAMN, you beat me to it....!    :tongue:
That was on the most recent episode of "The Universe" - "Secrets of the Sun" on the Discovery or Science channel....      :thumbup:


>^;;^<




heh, was thinking the same thing :awesome:

good job guys.


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[quote]Gumby said:
And if you are going to waste peoples time with your stupid questions, at least try to have grammar skills higher then that of a 7th grader.

READ DAMNIT! [/quote]


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OfflineSeussA
Error: divide byzero


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Registered: 04/27/01
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Re: When a star explodes, the shockwave moves faster than the local speed of light? [Re: nobhdy]
    #7784416 - 12/21/07 03:12 AM (16 years, 1 month ago)

Interesting to think about from a compression of gravity standpoint, assuming the shock wave pushes enough mass...


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Invisiblemaggotz


Registered: 06/24/06
Posts: 7,539
Re: When a star explodes, the shockwave moves faster than the local speed of light? [Re: DieCommie]
    #7785528 - 12/21/07 01:02 PM (16 years, 1 month ago)

:thumbup: nice.


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