2007-07-19 07:17:32 · 6 answers · asked by John S2005 3 in Science & Mathematics ➔ Physics
In a vacuum its approximated to 3x10^m/s. In a non-vacuum it can be slowed down.
2007-07-19 07:33:45 · answer #1 · answered by therealchuckbales 5 · 0⤊ 2⤋
In a vacuum there is no matter to store heat energy. So temperature is irrelevant. The beam would travel at the speed of light.
2007-07-19 07:22:26 · answer #2 · answered by Gwenilynd 4 · 2⤊ 0⤋
300.000 Km/sec. (closely) this speed doesn't vary by this condition, only can be modified in certain manner by the influence of strong magnetic forces. Watch the space, there is a high vacuum and a temperature close to absolute zero (-273 ºC) and the light velocity remains 300.000 Km/sec. The variation is mainly observed in the proximity of black holes, in those cases the subatomic particle (photon) increases its velocity to be absorbed by the highly gravity created there.
2007-07-19 07:35:00 · answer #3 · answered by mc23571 4 · 0⤊ 0⤋
nothing...
The speed of light through a medium is temp dependent but light always travels at c in a vacuum. Temp is irrelevant because in a vacuum there is no means of heat transfer. (except by radiation which is light its self)
Ironically...as I am typing this, I am preforming PL spectroscopy with a laser on a sample cooled to 4K and under high vacuum (10^-6 Torr).
2007-07-19 07:25:38 · answer #4 · answered by kennyk 4 · 0⤊ 1⤋
3*10^8 m/s
2007-07-19 07:33:00 · answer #5 · answered by Anonymous · 0⤊ 0⤋
It travels at the speed of light (186,000 miles per second). Always.
2007-07-19 07:23:31 · answer #6 · answered by lithiumdeuteride 7 · 2⤊ 0⤋