2006-06-13 16:19:53 · 24 answers · asked by Anonymous in Science & Mathematics ➔ Physics
299,792,458 meters per second. It is exactly that speed, and will always be exactly that speed, since the meter is defined as 1/299,792,458 of a light-second.
2006-06-13 16:28:21 · answer #1 · answered by Amarkov 4 · 1⤊ 0⤋
The speed of light *IN A VACUUM* is approx 186,000 miles per second or 300,000km/s. Photons have been slowed to approx 20 mph in certain gas filled chambers.
2006-06-13 16:25:16 · answer #2 · answered by quntmphys238 6 · 0⤊ 0⤋
Light travels through vacuum at a speed of about 300,000 kilometers per second. That's about 180,000 miles per second.
2006-06-13 16:23:24 · answer #3 · answered by Robin 2 · 0⤊ 0⤋
Speed is relative to an origin and destination point and differential speed of the two.
2006-06-13 16:42:08 · answer #4 · answered by Been_Around 1 · 0⤊ 0⤋
To be different,
If two cities are separated by 300km, the light makes to and fro motion between the two cities 1000 times in one second!
2006-06-13 18:48:18 · answer #5 · answered by Pearlsawme 7 · 0⤊ 0⤋
Speed of light is 300,000 kilometeres per second or 186,000 miles per second
2006-06-13 16:24:50 · answer #6 · answered by adam7425 2 · 0⤊ 0⤋
Accurately 299995400 meters per second..but approx 300000000 meters per sec
2006-06-13 17:20:08 · answer #7 · answered by Empty_life 2 · 0⤊ 0⤋
different depending on the material of travel yet 3x10^8 or 3E8 in a total vacuum.
2006-06-13 16:32:38 · answer #8 · answered by Anonymous · 0⤊ 0⤋
186,000 miles per second, but it varies. Every so often it is recalculated using some sort of laser they "ping" off the sun.
2006-06-13 16:24:32 · answer #9 · answered by rob h 1 · 0⤊ 0⤋
the distance light travels in a year,,,,way way far
2006-06-13 16:23:11 · answer #10 · answered by Anonymous · 0⤊ 0⤋