we all know abt speed of light i.e. 3*10^8 m/s\nbut what is the speed of darkness
206818
There is no speed of darkness.  Darkness is simply an absence of light.
15445
E=mc^2 \nEnergy = mass * (speed of light)^2, c = the speed of light (approx. 186,000 miles per second).
24616
Darkness has no speed. However if you could put a speed to darkness it would be amazing. If you could actually produce the absence of light, you would have created pure genious. As of right now, Darkness doesn't have a speed because it is nothing. That is like saying how much am i worth, if you don't have money. Technically you're worth $0 but am I trying to say that you are worth the absence of money. You don't have money so your worth nothing. Darkness isn't something that has a speed because it is the absence of light. I guess a better analogy would be: The absence of money has no worth.
76379
Immeasurable, because true darkness is a place where there is no God.  The speed in which it takes to get to this darkness is as fast as one can say no, I don't believe that Jesus died for my sins and rose again on the third day, no I don't believe in God the Father, no I don't believe in The Holy Ghost, and keep saying it until Jesus comes again.\nTrue darkness is less than nowhere, with less than no one there, there is less than no time, very less than lonely.\nWhen one is (less than) there they will wish that they could at least see the word dark or the word nothing, because at least they are letters.
470572
E=m c^2\nEnergy=Mass &#92;times (speed of light)^2
515377
the speed of light = 299 792 458 m / s or 1079252848800 M/H\ncircumference = 2*Pi*R \nso 2* 3.14159*R= 107925848800M/H\n1079252848800/(2*3.14159)=R\nRadius= 1.71768571 × 1011(<--- times 10 to the 11th power) meters
514387
This question is extremely confused/confusing!  For one thing, the speed of light (exceedable only by warp drive) is wavelength TIMES frequency, not wavelength OVER frequency, as implied by two of your lines.  Any Starfleet Academy student should know that.\n\nIgnoring that, I THINK that the nub of your question is this: presumably v/c is small in the original question that you must have been asked.  Call that small value x.  Then, for small x, a BINOMIAL SERIES expansion (NOT a Taylor expansion) tells you that \n(1 + x)^(-1) is approximately 1 - x, ignoring terms of order x^2 and higher.\n\nLive long and prosper.
64050
You've got it right! "c" is the usual way the speed of light is notated. .37 c would be 37% of the speed of light.
182768
relative means what you compare it to, so anything can be still. even me, although im moving on the earth at a very high speed. if i compare myself to my computer, i am standing still. \n\nspeed of light relative to whatever isnt moving, otherwise it wouldnt be the speed of light. actually this is getting advanced, i think the speed of light is a tricky subject because it does not obey traditional newtonian physics
108760
Shadow means no light. So id light is cut-off or changed shadow will be formed or changed at the speed of light.\n\nCoclusion:\n========================================\nspeed of shadow = speed of light = 3x10^8 m/s\n\nor 186,000 miles/s
93888
We would sense the darkness at EXACTLY THE SAME TIME that our planet would fall out of orbit. This is Einstein at heart, that gravity travels at the speed of light. Some recent thoeries say gravity travels slightly slower than light, but this is the best so far. They are equal.
671276
The speed of light *in a vacuum* is constant. Light does slow down as it passes through a transparent medium, like glass or air.\n\nA black hole does not affect the speed of light. But the escape velocity of a black hole is greater than the speed of light, so once a photon enters a black hole's "event horizon," it will never come out.
482042
acceleration at 9.8 m/s^2 for a year...\nincrease in speed 9.8 m/s each second\nseconds in a year = \n60 sec/min * 60 min/hr * 24 hrs/ day * 365 days/year =31536000 seconds\n31536000  * 9.8 = 309052800 m/sec after a year.\nthe speed of light = 299 792 458 m / s\nabout 10% of the speed of light.
84084
Actually light travels at the same speed no matter how fast it's source is traveling, nor which direction, as long there does not exist a certain level of gravity. Brightness of light however may be relative, except that you will have a definitive amount of photons in a given space...but we have no way of measuring that. The problem with the speed of light, however, is that gravity has an effect on it. Supreme amounts of gravity can actually attract photons and slow them down, or curve their direction towards the object. we do not know whether light actually orbits black holes because it's  constant inertia gives it enough centrifugal force, or if the light is actually sucked right into the object.\n\nYes everything is relative to something else. Your name spelled in English letters is even relative to other spellings of your name. Emotions are relative, hieght is relative, color is relative, even time is relative.\n\nThis is only true if you agree with Einstein's theory of relativity, but you couldn't say you didn't agree with it, because you would have to read all of it to understand. He has math that proves everything as relative, somehow.
312536
*sighs* Why can't people do any research on their own? Anyway... you are traveling through time right now, how else did you push those keys in sequence to form your question?\n\nI think that what you are attempting to refer to (lol I'm never gonna get a best answer replying like this) Is that as you travel faster and faster, closer and closer to the speed of light, time flow for you slows down, and the misconception of the public that if you go faster than light you will reverse time. WRONG!\n\nThat's not specifically what you asked though, so I will focus on teh misconceptions regarding the speed of light. First of all, accelerating mass to the speed of light is impossible as it would require an infinite amount of energy, so your question is meaningless. Second, since your question is meaningless tehre is nothing more to say except maybe a supporting and enlightening example. Third, I do not feel creative tonight so that example is gonna have to pass tis time, unless you email me and I will explain it better.\n\ndavid_lapierre@sbcglobal.net\n\nUnless this is just a school project, which I doubt since they are going donw the drain is sciences these days... you might wanna ask me a question, I can be very helpful when I know my time is not going to be wasted on a person who won't bother to take a few minutes to learn something... :-)
127694
No, the speed of light in vacuum is constant everywhere.\nLight follows the path of minimum energy (geodesics) in gravitational fields, which are bent around the masses.\n\nThe amount of bending at the surface of the sun is of the order of arc seconds. However close to a black hole the bending is so strong, that the light path bends around and around the hole, never to escape.
304652
The speed of light is constant, although there are differences in the electron fall rate-things, if that's what you're talking about.