Re: Uh Oh, Discrepancy Alert



Cliff wrote:

On Thu, 17 Aug 2006 01:25:21 GMT, BottleBob <bottlbob@xxxxxxxxxxxxx> wrote:



Cliff wrote:

On Tue, 15 Aug 2006 15:03:36 +0200, Ivan <ivan_h@xxxxxxxxxxxxxxxxxx> wrote:



Cliff wrote:

Side issue:
Ask this: What's the speed of light about a black hole?
What about E=m*c^2 THERE?

At the event horizon, c = 0, thus m=0, E=0.

Ask me, I've been there <G>


http://www.gsfc.nasa.gov/topstory/20020626bhlight.html

But you are well outside <G>.
BB is in Lintland.

Cliff:

Lightspeed in a vacuum has not been observed to change by a
gravitational field.


Cliff:

Who told you that one? Some nun again?

It seems to be the accepted perspective in the physics community.

It can slow down in gravitational fields.
http://www.mathpages.com/rr/s6-01/6-01.htm

You're not one of those Anti-Relativity cranks, are you? That isn't
why you've repeatedly Cliffoided answering my simple question:
Can matter be changed to energy? Yes or No?


Lightspeed wouldn't be much of a universal
constant if it changed everytime it passed, or went through,

A bit of glass?

Sure, and light can slow down to 38 MPH going through a Bose-Einstein
condensate... BUT light traveling through MATTER wasn't the point, I
clearly stated "Lightspeed in a *VACUUM* (which is considered a
universal constant), has not been observed to change by a gravitational
field."


some geodesic in curved space-time.

Which is exactly what it can do ..... what did you think caused
gravitational lensing (depending on units & your perspective)?

Gravitational lensing doesn't have anything to do with changing light's
velocity in a vacuum. Gravitational lensing is when the light's path is
curved by an intervening massive object that may curve spacetime enough
that a distant object appears in a slightly altered position. Now light
moving out of a gravitational field may lose energy and change
frequency, but it doesn't appear to alter it's velocity.


What's peculiar, is that you didn't challenge Ivan's comment that c=0
at the event horizon, which is not correct.

Feel free to comment yourself <G>.

Light travels at 299,792,458 meters per second in a vacuum,
theoretically inside a black hole as well as out. The PATH of the light
may be so strongly curved by spacetime curvature as a result of the
intense gravitational field of a black hole as to eliminate its ability
to escape, but the velocity supposedly remains the same according to
General Relativity, (our current "Best Guess" at to how the macro
universe works).


Is this an indication of
yet ANOTHER conceptual boo-boo on your part? LOL

I don't see where I'm actually required to ....

Required to what? Make a another conceptual boo-boo? LOL


Want to try to help him out of some of his many misconceptions?
Try ... the nuns & Aristotle did a bad job on him I think.

Sounds like more nunsense to me.

What is the speed of light at the event horizon?
From whose perspective?


=====================================================================
http://curious.astro.cornell.edu/question.php?number=266

Question:

Why doesn't gravity change the speed of light?
How come that the speed of light "c" doesn't change at all, even
slightly, when the light passes closely to a star or some similar big
object. We know that light bends in those situations, but what about
"c"?

Answer:

Yep, although light bends around a massive object like a black hole,
the speed of that light in a vacuum is always the same. This is because
the speed of light is directly dependent on the speed of the interaction
between the electric and magnetic fields (light is an electro-magnetic
wave, after all!). That speed of interaction is the same no matter where
the light is or who is watching it. Therefore, the speed of light is the
same for all observers at all points in spacetime.
=======================================================================

--
BottleBob
http://home.earthlink.net/~bottlbob
.

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