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speed of light

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speed of light

Speed at which light and other electromagnetic waves travel in a vacuum. Its value is 299,792,458 m per second/186,282 mi per second but for most calculations 3 × 108 m s−1 (300 million metres per second) suffices. In glass the speed of light is two-thirds of its speed in air, about 200 million metres per second. The speed of light is the highest speed possible, according to the theory of relativity, and its value is independent of the motion of its source and of the observer. It is impossible to accelerate any material body to this speed because it would require an infinite amount of energy.



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? Mentioned in ? References in classic literature
 
Then there was a wild yelp of agony and the poodle went sailing up the aisle; the yelps continued, and so did the dog; he crossed the house in front of the altar; he flew down the other aisle; he crossed before the doors; he clamored up the home-stretch; his anguish grew with his progress, till presently he was but a woolly comet moving in its orbit with the gleam and the speed of light.
Tom Sawyer by Twain, Mark View in context
The whole composite vision was achieved with the speed of light, producing no pause in the conversation, nor interrupting his calm train of thought.
Martin Eden by London, Jack View in context
At first, he was dead of all the diseases that ever were known, and of several bran-new maladies invented with the speed of Light to meet the demand of the occasion.
Little Dorrit by Dickens, Charles View in context
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