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
91
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
Whatpromptedthisconversation?[br][originaltext]M:Idon’tunderstand.Igo
1935年10月19日,中共中央率领的红军抵达陕甘苏区的()。至此,红
全站仪只能够测角、测距和侧高差。
在房屋建筑工程施工阶段监理中,监理人员对关键部位、关键工序的施工质量实施全过程现
2012年6月1日,某市政府根据城市规划进行旧城改造,决定征收城区内某
以下属于RQFII试点业务与QFII的主要区别的是()。 A.募集的投资资金
根据《关于加强中药饮片监督管理的通知》,合法的行为包括A.药品生产企业外购中药饮
遇光极易氧化,使其分子内脱氢,产生吡啶衍生物的药物有A.硝苯地平 B.尼群地平
低血容量性休克抑制期微循环特点是A.静脉回心血量增加 B.微循环收缩 C.心
某房地产开发商拖欠承包商工程款700万元,承包商认为可以用开发的商品房抵账,因此
最新回复
(
0
)