Could you negate the speed of light?

Question

The speed of dark?

-186,000 miles per second

I don't know. EXPLIAN. and don't call me stupid.

Answer 1

You can't negate the speed of light, but you can slow it down by passing it through a medium, such as glass.

Not too long ago, scientists set a record for the slowest speed of light by firing a laser through extremely cold sodium atoms, which slowed light down to 38 mph.

The sodium atoms were almost at absolute zero, in a state of matter called a Bose-Einstein condensate.

http://abcnews.go.com/Technology/story?i...

Bose-Einstein condensate:

http://www.colorado.edu/physics/2000/bec...

Answer 2

dark is the absence of light. dark doesnt exist, it is not a physical thing it is an idea.

its like asking what the speed of silence is.

Answer 3

No, I won't call you stupid.  I will explain just a little bit of physics, if you don't mind (and I'm assuming you don't, since you asked!)

Speed and velocity are two different things.  Speed tells you how fast an object is moving, but it says nothing about its direction.  For example, if you say that a car is driving at 55 miles per hour, that tells me the car's speed, but it doesn't tell me anything about which way the car is going.

If you tell me the speed AND the direction, then you've told me the velocity.  Using our car example again, suppose you tell me that it's traveling at 55 miles per hour north.  Since you included the direction, I now know the car's velocity.  Velocity is speed with direction.

In physics, there are several ways of indicating direction.  For example, you could give a compass heading (north, east, south, west, northwest, southeast, and so on...).  You could give an angle, provided we both agree on where the starting point for measurement is.  For example, if you tell me that a boat is moving 5 knots at 45º, is that 45º relative to north, or 45º relative to MY heading?  If you're observing an object moving along a linear path, you can call one end of the line positive and one end negative.  If the object is moving at 20 meters per second toward the positive end, then you would report its velocity as +20 m/s.  If the object turned around but kept its speed, then you would report its velocity as -20 m/s.

So a speed can't really be negative, because speed doesn't tell you direction.  A velocity CAN be negative, but all that means is that the object is moving in the direction OPPOSITE to the positive direction.  Its speed is still a positive number.

Now if you're okay with all of that, let's talk about the "speed of dark."

Dark is simply the absence of light, just as cold is the absence of heat.  Unlike light, dark doesn't travel outward from a "dark source" in "dark waves".  There is no way to observe "dark interference patterns" (well, to be fair, you CAN see dark spaces between the light patches in a light interference pattern, but those are just places where the light waves "cancel out")  For that reason, there is no "speed of dark."

I hope that helps.  Good luck!

Answer 4

Since light comes from a source and is either a particle or a wave it has velocity. But dark is not identified as either a wave or a particle.