| 单词 | c |
| 释义 | c 1. Symbol for the velocity of light in a vacuum, which is exactly 299,792.458 kilometers per second, or 186,282.397 miles per second. The nominal figures, used for ease of reference and approximate calculations, are 300,000 km/s and 186,000 miles per second. The velocity of propagation (Vp) is sensitive to the medium. See also Vp. 2. In 1900 the Ladies Home Journal magazine predicted that by the year 2000 the letters c, x, and q would be banished from the English alphabet.The expectation was that spelling would be phonetic and that those letters would be unnecessary. It was a perfectly logical prediction, but no more correct than the predictions that the use of jetpacks, teleportation, videophones, and smell-o-vision would be widespread. ( Note: I make no predictions in this dictionary.) See also Smell-O-Vision, teleportation, and videophone. |
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