Light travels at a speed of 186,000 miles a second or 700 million miles an hour.
2006-09-27 06:39:16 · 18 answers · asked by G 6 in Science & Mathematics ➔ Astronomy & Space
It varies but is infinitely faster than light. Here is an example:
person A turns on a flashlight and a beam of light travels toward person B who is let's say ten miles away. Just as the beam arrives at B, A will turn off the light. For a short moment, B will no longer be dark, but now A is dark. In the initial setup B was dark and A was in the light.
Conceptually, the dark moved from B to A instantaneously almost compared to the light having to actually travel to B from A.
We have the same concept of a "hole" moving in a semiconductor -it can move much faster than the electrons in the semiconductor.
For the hole analogy consider a movie theatre. The entire row is filled except for a seat on the other end. You (as an electron ) can run around to the far end and sit in the space. that will have a certain velocity and time....
however, you could get all the people in the row to all stand and then shift over one seat and the the hole, almost instantly moves from the far end of the row of seats to the near end and then you can sit.
holes don't really exist, but we can make the electrons move around like they do and can even talk about the holes moving in our models and get faster than electron speeds.
same with dark.
:-)
2006-09-27 07:09:13 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Hi. c. Shine a flashlight onto a wall. When you turn it off the darkness (the absence of light) travels at c. About one billionth of a second per foot.
2006-09-27 13:44:32 · answer #2 · answered by Cirric 7 · 1⤊ 0⤋
Since darkness is when light is no longer present, then it should be the same speed. It's just light leaving, so it can only go as fast as light.
2006-09-27 13:41:59 · answer #3 · answered by ohmneo 3 · 1⤊ 0⤋
Exactly the same speed as light, but always right angles to the direction of any photons.
2006-09-27 14:14:22 · answer #4 · answered by quntmphys238 6 · 1⤊ 0⤋
The Dark has no speed. The dark is simply the absence of light.
2006-09-27 14:46:22 · answer #5 · answered by Anonymous · 0⤊ 1⤋
runs at the same speed that it is afraid of the light chasing it. which is 186,282 miles per second by the way. or about one foot per nanosecond, depending on the density of the medium it is capable of passing through.
2006-09-27 15:13:08 · answer #6 · answered by yehoshooa adam 3 · 1⤊ 0⤋
The speed of Dark is much too fast.
It seems that every day ends much earlier than I would like.
2006-09-27 13:54:26 · answer #7 · answered by actuator 5 · 0⤊ 1⤋
At full gallop, about 27 miles an hour.
2006-09-27 13:48:10 · answer #8 · answered by mcmustang1992 4 · 0⤊ 1⤋
the same speed of light.
2006-09-28 00:00:30 · answer #9 · answered by Eddy G 2 · 0⤊ 0⤋
Dark is instantaneous. It occurs everywhere the instant that light is gone.
2006-09-28 12:04:08 · answer #10 · answered by Anonymous · 0⤊ 0⤋