300 million meters per hour
300 million kilometres per hour
300 million kilometres per second
300 million meters per second
The speed of light, speed at which light waves propagate through different materials. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).. The speed of light is considered a fundamental constant of nature.
- The speed of light in vacuum has been measured to be 300 million meters per second. This is the fastest that anything has been observed to move.
- The speed of light in vacuum is 3 × 108 m/s. Sunlight takes about 8 minutes and 20 seconds to reach the Earth.
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