mega thread Last Poster Wins

[Xe__or 4,378]

2 minutes ago, CypherHoof said:

Not in a vacuum, in the SUN.

In the sun, the atoms are fairly closely spaced; the weight of the stellar mass is supported by the pressure excursions (that is, noise) of the fusion reactions in the core, which propagate at about the normal speed of pressure waves in a solid (I think the average is about 17 times the speed of sound in air) so may take a few hundred hours to reach the outer corona (where of course they are lost)

Light however, also has to travel outwards from the core, and can take many thousands of years to do so.

(also, many things can travel faster than light; they glow blue when they do so)

The absolute speed limit for the universe is the speed of light in a vacuum; outside of that environment, all bets are off (but they still can't go faster than 'c')

I thought you were talking about surpassing c; then I guess you're right

[CypherHoof 26,483]

2 minutes ago, Xeltor said:

I thought you were talking about surpassing c; then I guess you're right

Well, I can't be held responsible for what you think, thank Celestia

[Xe__or 4,378]

Just now, CypherHoof said:

Well, I can't be held responsible for what you think, thank Celestia

I didn't think you were talking about specific situations like the Sun one   

[CypherHoof 26,483]

Just now, Xeltor said:

I didn't think you were talking about specific situations like the Sun one   

And yet you literally quoted me saying "The sun is the best known example"....

[Xe__or 4,378]

Just now, CypherHoof said:

And yet you literally quoted me saying "The sun is the best known example"....

Well I didn't think you were talking INSIDE the sun  Don't mind me, just woke up; so my brain engines have yet to start  

[CypherHoof 26,483]

Just now, Xeltor said:

Well I didn't think you were talking INSIDE the sun  Don't mind me, just woke up; so my brain engines have yet to start  

What else would I be talking about? there is no sound in space. You clearly need a coffee or three

[Xe__or 4,378]

Just now, CypherHoof said:

What else would I be talking about? there is no sound in space. You clearly need a coffee or three

Yeah coffee would be nice But I don't have any   

[CypherHoof 26,483]

7 minutes ago, Xeltor said:

Yeah coffee would be nice But I don't have any   

Well, I have lots, but I guess it would be cold by the time it got to you (Not least because its a bank holiday here in the UK, so the postal service doesn't run today)

[Nsxile 29,278]

Just now, Xeltor said:

How the hell can sound be faster than light?  

It can't... I was saying that light always travels faster than sound.

Just now, CypherHoof said:

Not in a vacuum, in the SUN.

In the sun, the atoms are fairly closely spaced; the weight of the stellar mass is supported by the pressure excursions (that is, noise) of the fusion reactions in the core, which propagate at about the normal speed of pressure waves in a solid (I think the average is about 17 times the speed of sound in air) so may take a few hundred hours to reach the outer corona (where of course they are lost)

Light however, also has to travel outwards from the core, and can take many thousands of years to do so.

(also, many things can travel faster than light; they glow blue when they do so)

The absolute speed limit for the universe is the speed of light in a vacuum; outside of that environment, all bets are off (but they still can't go faster than 'c')

The light is actually reabsorbed over and over again by other atoms in the suns core, hence why it takes so long for it to escape. It doesn't mean it's slower than sound considering light still travels at the constant speed of 670.6 million mph. Through a medium such as water, you are correct that light does travel slower (as is the case in Cerenkov Radiation) than it usually does... But it still does not travel slower than sound.

[CypherHoof 26,483]

7 minutes ago, Nsxile said:

It can't... I was saying that light always travels faster than sound.

The light is actually reabsorbed over and over again by other atoms in the suns core, hence why it takes so long for it to escape. It doesn't mean it's slower than sound considering light still travels at the constant speed of 670.6 million mph. Through a medium such as water, you are correct that light does travel slower (as is the case in Cerenkov Radiation) than it usually does... But it still does not travel slower than sound.

The SPEED of light in the sun is probably faster than the speed of sound - but with all the atoms in the way, light can't travel that fast. The sun is an example of an enviroment where the speed light travels isn't the same as the speed of light in that material (because the material is actually opaque to light)

(as another thought - and given the Heaviside Legacy is in play now - how does a Rainboom relate to Cherenkov Radiation?

Edited August 26, 2019 by CypherHoof

[Nsxile 29,278]

Just now, CypherHoof said:

The SPEED of light in the sun is probably faster than the speed of sound - but with all the atoms in the way, light can't travel that fast. The sun is an example of an enviroment where the speed light travels isn't the same as the speed of light in that material (because the material is actually opaque to light)

(as another thought - and given the Heviside Legacy is in play now - how does a Rainboom relate to Cherenkov Radiation?

Light does travel that fast from the point of it's creation. It just can't travel very far with the atoms in the way of it. If you were to measure the average speed between the point of the photon's creation and the point the photon was absorbed by another atom, it would still be 670.6 million mph 

Hmm... But that would be assuming Equestria's physics would be the same as ours... Which may not be the case.

[CypherHoof 26,483]

7 minutes ago, Nsxile said:

Light does travel that fast from the point of it's creation. It just can't travel very far with the atoms in the way of it. If you were to measure the average speed between the point of the photon's creation and the point the photon was absorbed by another atom, it would still be 670.6 million mph 

That is true of any transparent medium though; all materials consist of atoms, and spaces between atoms (which are effectively a vacuum, or there would be an atom there)

How light travels though a transparent medium isn't technically the same as when photons are absorbed and re-emitted in the discrete particle model, but that has no explaination for the change in speed at all - only when you start looking at the problem though the lens of wave probability theory and electron shells, does any explaination emerge, and in that domain, the diference between a photon "passing though, but slowly" and "being absorbed and re-emitted" isn't that great.

 

7 minutes ago, Nsxile said:

Hmm... But that would be assuming Equestria's physics would be the same as ours... Which may not be the case.

Well, my own theory is that the speed of Magic is involved. Magic in air is clearly not anywhere near lightspeed (given magic bolts can be dodged) but by terrestial standards, can still be pretty fast (given lightning bolts can also be dodged; Dashie does this on occasion). So my theory is that, as the pressure cone forms around Dashie's hooves when she approaches transition speed, she is actually catching up to her own magic (her "wingpower") as she projects it into the air in front of herself; at transition, she shatters that field entirely and only the fact that magic propagates faster though ponies (pegasus and presumably unicorn) than air stops her from suffering severe friction burns as she loses her protective shield (which also would explain why the wonderbolts and Rarity aren't severely hurt when she hits them at a serious multiple of the speed of sound, and changes their vector to be first parallel to the ground, then skywards....)

but Heaviside teaches that the phenomena of a mach cone and Cherenkov radiation aren't that different, so extending that to Equestrian (in this case, wingpower) magic would seem reasonable, given how visibly similar a rainboom is to a sonic boom or transluminal effects.

[Xe__or 4,378]

Browser 

[BroomsNHops 260]

meep

[Nsxile 29,278]

Meh

[CypherHoof 26,483]

ll,

Well, what is seen can't be unseen...

[BroomsNHops 260]

 

Now this is what we post

[Nsxile 29,278]

1 minute ago, BroomsNHops said:

 

Now this is what we post

Banned for questioning reality 

[BroomsNHops 260]

But I didn't question it

[Nsxile 29,278]

Banned because but the image says you did? 

[BroomsNHops 260]

*poofs out of existence*

[Nsxile 29,278]

..

[CypherHoof 26,483]

But the Babel Fish proves the non-existence of God?

[ExplosionMare 26,358]

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[Nsxile 29,278]

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