What is the speed of dark?
Dark is created by the absence of light, so I would suppose that you would say it is 3x10^8 m/s, the speed of light. Although, I believe the true answer is dark has no speed at all.
But if you open a closed cupboard which is dark inside, you can see the light slowly enter but you cannot see the dark escape. Ergo, dark is faster than light…?
Years ago someone had a hack article on “THe Darkon Theory of Light”, which posited that dark was made up of elementary particles called “darkons”. You could measure the speed of datkons by measuring the speed of the interruption in a flow of darkons, which can be called a photon. Its speed, as mongrel_8 noted, is about 3 X 10 to the 10 centimeters/sec.
As for you, walor:
You can SEE light entering? No offense, but what are you smoking?
Nope…as mongrel_8 said dark is the absence of light. The dark doesn’t escape…the light escapes at light speed leaving behind dark.
Ergo, dark itself has no speed but dark is created at light speed. And ‘no speed’ doesn’t mean zero in this case as if it’s standing still because it’s not even doing that much. Asking the speed of dark is like asking what happened before the universe was created. There just isn’t any meaningful answer.
Welcome to the SDMB, walor.
Now would be a good time to make some witty comment to let everyone know you’re joking about this so you don’t get the wrong rep.
Take my word for this, dude. Even if you don’t understand what I’m talking about. Hell, especially if you don’t understand what I’m talking about. Just say, “Thanks for the info. Good to be here. Glad to have your attention. Hi, Opal!” and let this thread die.
Thanks for the inside track KneadTo Know
Never being one to shun good advice…
‘Thanks for the info. Good to be here. Glad to have your attention. Hi, Opal!’
Let this thread die at the speed of dark.
The Journal of Irreproducible Results (a reputable scientific journal if ever there was one ) dealt with this question in a 1995 article by C. Bowers. The following is a the opening paragraph:
(side note: I was really tempted to use the last sentence of that paragraph in the introduction to my Master’s Thesis, but then I thought better of it.)
Let me start up this vacuum pump for an analogy demonstration of the dark theory…
We must also bear in mind de Selby’s view that darkness is simply an accretion of ‘black air’, i.e., a staining of the atmosphere due to volcanic eruptions too fine to be seen with the naked eye and also to certain ‘regrettable’ industrial activities involving coal-tar by-products and vegetable dyes (and as a result of that, sleep is simply a succession of fainting-fits brought on by semi-asphyxiation).
There is more to read at http://lightning.prohosting.com/~amphi/shtml/page.shtml?deselby.html
You may also want to read up on The Dark Sucker Theory.
Surprising though it may be, malden, in this case the JIR is correct: Shadows can, indeed, travel at speeds in excess of c, and because of this, can (in some reference frames) arrive at a destination before they left. the key is that you can transmit neither energy nor information on the shadow itself.
Thanks for The Dark Sucker lead frogstein. It’s reassuring to know that dark exists, although there is no reference to its speed.
Going one step further, if dark exists, it must have mass. Is it heavier or lighter than light? Perhaps light is called light because it is not as heavy as dark.