In fact, the speed of light is one of the easiest ways to accurately measure large distances. The speed of light is the distance photons travel within a given unit of time and is most often measured as meters per second. The speed of light is precisely 299,792,458 meters per second. ...
百度试题 结果1 题目 12. A light year is the distance light travels in one year at a speed _ (speed) of 299,792 kilometres per second. 相关知识点: 试题来源: 解析 答案见上speed 反馈 收藏
light speed,c constant- a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant" speed,velocity- distance travelled per unit time Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University...
( C )3. Light Year is related to A. energy B. speed C. distance D. intensity 相关知识点: 试题来源: 解析 答案见上【答案】该题考查名词词义辨析。energy能量,speed速度,distance距离,intensity强度;根据常识,光年是指的是光在真空中,沿着直线,经过一年的时间所传播的距离,结合句子信息推知句意:光年与...
"To obtain an idea of the size of a light-year, take the circumference of the Earth (24,900 miles), lay it out in a straight line, multiply the length of the line by 7.5 (the corresponding distance is one light-second), then place 31.6 million similar lines end to end," NASA's ...
In July 5th 2014 an occultation of Mars by the Moon was visible in South America. Citizen scientists and professional astronomers in Colombia, Venezuela and Chile performed a set of simple observations of the phenomenon aimed to measure the speed of light and lunar distance. This initiative is ...
A light year is a measure of ___. A. time B. distance C. speed D. mass 相关知识点: 试题来源: 解析 B。本题考查光年的概念。光年是长度单位,是计量天体间距离的单位,所以答案是 B。选项 A“time”是时间;选项 C“speed”是速度;选项 D“mass”是质量。反馈...
at breakneckspeed(= fast in a way that is dangerous) 以不要命的速度 牛津词典 travelling at thespeedof light/sound 以光速 / 音速行进 牛津词典 the processingspeedof the computer 计算机的处理速度 牛津词典 This course is designed so that students can progress at their ownspeed. ...
百度试题 结果1 题目 单句改错 A light-year is the distance light travels in one year at speed of 299,792 kilometers per second. 相关知识点: 试题来源: 解析 at后加a 反馈 收藏
aLight travels at a speed which is about a million times faster than the speed of sound. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke from his gun before the sound reaches your ears. 光...