2007-10-06 08:21:36 · 3 answers · asked by lambo6 1 in Science & Mathematics ➔ Chemistry
In metric units, c is exactly 299,792,458 metres per second (1,079,252,848.8 km/h.
The speed of light is about 670,616,629.2 miles per hour or 983,571,056 feet per second, which is about 186,282.397 miles per second, or roughly one foot per nanosecond.
The speed of light is in a vacuum is constant and the same for ALL forms of electromagnetic radiation like light, gamma rays, radio and all other photons. The difference between x-rays and visible light and TV and radio waves is only the frequency they are all photons though.
2007-10-06 08:33:20 · answer #1 · answered by Dan S 7 · 0⤊ 0⤋
Light velicity in vacuum is Со = 299 792 458 m/s.
Velicity of electromagnetic waves in vacuum is c=(2.99792458 x eighth power of 10) m/s which is approximately equal to (3 x eighth power of 10) m/s
2007-10-06 15:44:31 · answer #2 · answered by nastya_k_ru 2 · 0⤊ 0⤋
299 792 458 m / s
2007-10-06 15:32:03 · answer #3 · answered by snydrew 2 · 0⤊ 0⤋