| 单词 | speed of light |
| 释义 | speed of lightThe distance light can travel in a unit of time through a given substance. Light travels through a vacuum at about 186,000 miles, or 300,000 kilometers, per second. (See E = mc2, electromagnetic waves, relativity, and twin paradox.) notes for speed of lightA light year, or the distance light can travel in a year, is over five trillion miles. notes for speed of lightLight from the sun takes about eight minutes to reach the Earth. notes for speed of lightLight from the moon, and other electromagnetic radiation from the moon, takes about a second and a half to reach the Earth. In conversations between astronauts on the moon and their ground crews, there are lapses of about three seconds between exchanges, because of the time it takes for radio waves to make a round trip between the Earth and the moon. notes for speed of lightThe special theory of relativity states that the speed of light as measured by all observers is the same. Words nearby speed of lightspeed light, speed limit, speed metal, speed networking, speedo, speed of light, speedometer, speed ramp, speed-read, speedrun, speed shop The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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