In a vacuum, light travels at a constant speed of 299,792,458 metres per second. 在真空中,光以每秒299,792,458米的恒定速度传播。 Scientists use the speed of light to measure distances between stars in space. 科学家利用光速来测量太空中恒星之间的距离。 A light-year is a unit that represent...
speed of light - the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second light speed, c constant - a number representing a quantity assumed to have a fixed value in a sp...
aAs defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year.the light-year is 9,460,730,472,580.8 km or 63,241 au. 如是由国际天文学联合IAU (定义的),光年是光旅行在真空在一个朱利安year.the光年是9,460,730,...
The speed of light is a universal constant in a vacuum, like the vacuum of space. However, light *can* slow down slightly when it passes through an absorbing medium, like water (225,000 kilometers per second = 140,000 miles per second) or glass (200,000 kilometers per second = 124,...
1.The distance that light travels in a vacuum in one year, approximately 9.46 trillion kilometers (5.88 trillion miles). 2.oftenlight yearsInformalA long way:a small town light years away from the action of the capital. American Heritage® Dictionary of the English Language, Fifth Edition. ...
n.the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers 同义词:light-year 学习怎么用 双语例句 The distance can be expressed in light years. 距离可以用光年表示。 A place that requires one year for light to reach is one light year distant ...
Alight yearis the distance light travels in a year, equal to 9,460,730,472,580.8 kilometers. According to the International Astronomical Union (IAU) definition, a light year is equal to the distance that light travels in a vacuum, without the influence of gravitational fields, in one Julian...
英语解释 the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second 相似短语 speed of light光速,光速 speed light电子闪光 ...
Light travels in a zero-index medium without accumulating a spatial phase, resulting in perfect spatial coherence. Such coherence brings several potential applications, including arbitrarily shaped waveguides, phase-mismatch-free nonlinear propagation, large-area single-mode lasers, and extended superradiance...
Light travels at a speed of 2.998 x 10[{MathJax fullWidth='false' ^8}] m/s in a vacuum. What is the frequency of radiation whose wavelength is 0.69 nm? Express the frequency in inverse seconds to three significant digits. What happens to mass at the speed of light?