首页
登录
职称英语
[originaltext] Light travels at a speed that is about a million times faster
[originaltext] Light travels at a speed that is about a million times faster
游客
2023-09-12
58
管理
问题
Light travels at a speed that is about a million times faster than the speed of sound. In one second, light travels about 300, 000 km, but sound travels only about 334 meters. 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 come from his gun before the sound reaches your ears.
This great speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays left the moon 1.3 seconds before they reached you. The nearest star is so far away that the light that you can see from it tonight started to travel towards you about four years ago at a speed of nearly 20 million km per minute. In some cases, the light from one of tonight’s stars started on its journey to you before you were born. Thus, if we want to be honest, we cannot say, "the stars are shining tonight.” We have to say, "the tars look pretty. They were shining four years ago, but their light has only just reached the earth."
选项
A、1.3 seconds.
B、Eight minutes.
C、A life’s time.
D、About four years.
答案
D
解析
事实细节题 原文中讲到距离地球最近的恒星离地球大约是四光年。
转载请注明原文地址:https://tihaiku.com/zcyy/3007834.html
相关试题推荐
[originaltext]Therearetwofactorswhichdetermineanindividual’sintelli
[originaltext]Therearetwofactorswhichdetermineanindividual’sintelli
[originaltext]M:Doyouknowthethingthat’salwaysstruckmeasoddaboutopi
[originaltext]W:Yoursurveysoundsverygood.Howmanypeoplefilleditin?M:
[originaltext]W:Holditrightthere.Putyourhandsagainstthewall.M:ButI
[originaltext]W:Holditrightthere.Putyourhandsagainstthewall.M:ButI
[originaltext]W:Holditrightthere.Putyourhandsagainstthewall.M:ButI
[originaltext]W:Holditrightthere.Putyourhandsagainstthewall.M:ButI
[originaltext]W:Holditrightthere.Putyourhandsagainstthewall.M:ButI
[originaltext]LasttimeweoutlinedhowtheCivilWarfinallygotstarted.
随机试题
TheCarnegieFoundationreportsaysthatmanycollegeshavetriedtobe"all
Somesocialscientistshaveclaimedthatdivorceharmschildrenfortheres
男,60岁,进行性吞咽困难,仅能进流质,诊断为中段食管癌。有长期吸烟史。在全麻下
以下脱位牙齿的清洁处理不正确的是A.手握冠部行生理盐水冲洗 B.污染严重时可用
关于股权投资基金的投资范围,以下表述错误的是()。A.上市公司公开发行的债
法定存款准备金率由银监会决定。()
境内某单位将船舶出租到境外的,相应车船的车船税应()。A.正常征收 B.
(2015年真题)某企业为增值税一般纳税人,适用的增值税税率为13%,2019
在市场经济条件波动较大的情况下编制建设工程项目施工图预算,为能够较准确地反映实际
在灯具现场检查中,说法正确的是()。A.Ⅰ类灯具外露可导电部分应具有专用的PE
最新回复
(
0
)