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mee
Sep11-04, 12:27 PM
the speed of light is 186000 mps or some such compared to what? :)
PRodQuanta
Sep11-04, 12:33 PM
Rephrase please. I'm not sure what you are asking.

Paden Roder
jcsd
Sep11-04, 12:33 PM
The speed of light is approximately 186,000 miles per secpnmd or exactly 299 792 458 metres per second. I don't know what you mean by 'compared to 'what', the speed of light is the same in all inertial frames.
PRodQuanta
Sep11-04, 12:34 PM
Oops, sorry, didn't see your post there jcsd.

Paden Roder
mee
Sep11-04, 12:46 PM
The speed of light is approximately 186,000 miles per secpnmd or exactly 299 792 458 metres per second. I don't know what you mean by 'compared to 'what', the speed of light is the same in all inertial frames.

So whatever inertial frame one is measuring by, light travels at c as if the inertial frame was still?
russ_watters
Sep11-04, 01:13 PM
So whatever inertial frame one is measuring by, light travels at c as if the inertial frame was still? Yes. And that is the 2nd postulate of Special Relativity.