GRQFT's latest activity
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GGRQFT replied to the thread High School What Medium Does Light Travel Through in Space?.And how does that relate to the geometry of spacetime? Which requires a measurement of the E (hv) of a photon.
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GGRQFT replied to the thread High School What Medium Does Light Travel Through in Space?.I just visited the NIST website and found the diagram below. This is how they describe c: And this is their list of the seven...
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GGRQFT replied to the thread High School What Medium Does Light Travel Through in Space?.So, presumably we can obtain a value for c from GR. Do you happen to know the relevant equation? And so how would we calculate c by...
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GGRQFT reacted to Dale's post in the thread High School What Medium Does Light Travel Through in Space? with
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The invariant speed is determined by the geometry of spacetime. The speed of light is determined by the fact that the photon is... -
GGRQFT reacted to Sagittarius A-Star's post in the thread High School What Medium Does Light Travel Through in Space? with Like.
The vacuum permittivity is a measurable quantity, which depends on the fine structure constant ##\alpha##: ##\varepsilon _{0}={\frac...
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GGRQFT reacted to Dale's post in the thread High School What Medium Does Light Travel Through in Space? with Like.
In SI units it does show up in numerous important equations. But in each of those important equations I could get rid of c by changing...
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GGRQFT reacted to Matterwave's post in the thread High School What Medium Does Light Travel Through in Space? with Like.
Maybe to clarify a bit, we can step back. There are constants of the universe which we do not know how to explain. They are called...
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GGRQFT replied to the thread High School What Medium Does Light Travel Through in Space?.Yes, of course there is only one perpendicular angle. That was not my point. What I was arguing is that there are an infinite number...
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GGRQFT replied to the thread High School What Medium Does Light Travel Through in Space?.Okay, this is a *very* useful analogy. So let's go through it carefully. However, first I just want to mention that the words...
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GGRQFT replied to the thread High School What Medium Does Light Travel Through in Space?.Thanks. This a nice summary of ideas that I'm aware of but have not fully accepted. The speed of light (or more appropriately the...
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GGRQFT reacted to renormalize's post in the thread High School What Medium Does Light Travel Through in Space? with Like.
Nothing! It's a postulate (but well-founded on empirical evidence!) that our (local) universe is a 4D Minkowski spacetime with an...
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GGRQFT replied to the thread High School What Medium Does Light Travel Through in Space?.Okay. So what then determines the speed of light in a vacuum (or in any medium for that matter)?
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GGRQFT replied to the thread High School What Medium Does Light Travel Through in Space?.Okay, I'll have to think about what you said. But I'm curious what you think about c = 1/√(ε₀μ₀). Are you saying that we should not...
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GGRQFT replied to the thread High School What Medium Does Light Travel Through in Space?.Okay, I'll read what you referred to, but what about the Casimir effect, the Lamb shift, spontaneous emission, etc.? Surely these are...
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GGRQFT replied to the thread High School What Medium Does Light Travel Through in Space?.Right. That's what I was referring to when I said that "...perhaps these constants correspond to the extent to which propagating light...
