首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、The light will bend a lot. B、The speed limit will be lower. C、The speed of light will not change. D、The speed of light will be
A、The light will bend a lot. B、The speed limit will be lower. C、The speed of light will not change. D、The speed of light will be
admin
2013-06-02
39
问题
If you’re driving on a highway, the only thing keeping you from going faster than the speed limit is your sense of civic duty, or perhaps that police car up ahead. There’s one speed limit, however, that most scientists agree nothing will ever break. That’s the speed of light: 186, 280 miles per second. As it trav-els through deep space, light moves at exactly this speed, no more and no less. The speed of light is so reliable, we even use it to measure distances between the stars. If it takes starlight fifty years to reach us, we say that this star is fifty light years away. You might be surprised to learn, however, that light itself does not always travel at the speed of light. Our highways generally have a higher speed limit, but once you enter a city or residential street, the speed limit lowers. Likewise, light travels at its maximum speed through a vacuum but it slows down when it enters air, water, or some other medium. Through air, light moves a little slower: forty miles per second less than its maximum speed. Through glass, light moves almost eighty thousand miles per second slower.Light moves more than a hundred thousand miles per second slower through a diamond less than half its speed in a vacuum. Light moves so quickly anyway, do we ever notice this change in speed? Actually, we do. When light slows down it also bends slightly. If light always moved at its maximum speed, none of our telescopes, eyeglasses or even our eyes themselves would ever work.
1.What does the passage mainly talk about?
2.Why do we use light speed to measure distances between the stars?
3.What will happen if light moves through a diamond?
4.What would happen if light always moved at its maximum speed?
选项
A、The light will bend a lot.
B、The speed limit will be lower.
C、The speed of light will not change.
D、The speed of light will be lower.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/jd67777K
0
大学英语六级
相关试题推荐
A、Hewasinjuredinafightandhadtoleavethegame.B、Hefoughtwithanotherplayer.C、Hegotinafightwithafanandwast
A、Ithasbecomeaclumsygiant.B、Thecityhassufferedfromlong-timefamine.C、Therewasepidemicdiseasethattime.D、Ithas
Theessentialproblemofmaninacomputerizedageremainsthesameasithasalwaysbeen.Thatproblemisnot【B1】______howto
A、SubstituteforLauraatwork.B、MeetLauraattherestaurant.C、GooutoftownwithLaura.D、Acceptafull-timejob.A对话中男士提到S
Patfeltillateasewithhisgirlfriend,____________(考虑是否要宣布他的事).
______(中国发生的所有变化中),themostinfluentialonewastheestablishmentofthePRC.
A、Avisittoaprison.B、Theinfluenceofhisfather.C、Atalkwithsomemiserableslaves.D、HisexperienceinthewarbetweenF
LouiseBourgeoiswasaninfluentialartistbestknownforherlargesculpturesofmetalspiders.Thoughherworksare【B1】______
A、It’stoosmall.B、Ithasplentyoflight.C、It’sratherexpensive.D、Itdoesn’thavemanyclosets.B女士说她只对2房的那套感兴趣,然后让男士介绍情况,男
A、Playtennis.B、Returntohishometown.C、Jointhewomanfordinner.D、Gotoacoffeeshopwiththewoman.B选项均以原形动词开头以及选项中的Joi
随机试题
探头屏蔽性能测试时,每一个测算位置的计数都不应该超过本底标准差的
浅Ⅱ度烧伤创面主要表现是
患者,女性,28岁,3天前中指末节指腹刺伤,未做特殊处理。今天发现手指明显肿胀、皮肤苍白,自感有搏动性跳痛,夜间为甚,全身不适。选择抗生素最理想的依据是
根据《水电水利工程钢闸门制造安装及验收规范》(DL/T5018—2004),闸门安装好后,应在无水情况下作全行程启闭试验,试验前应做下列()准备。
佳洁上市公司(以下简称佳洁公司)拥有一条由专利权A、设备B以及设备C组成的生产线,专门用于生产甲产品,该生产线于2003年1月投产,至2009年12月31日已连续生产7年。另有一条由设备D、设备E和商誉(是2008年吸收合并形成的)组成的生产线专门用于生产
下列加密方式只在源、宿结点进行加密和解密的是()。
下述程序段在运行时的显示结果是【】。 Cls x=1.34+8 PrintLen(x)
ForthepeoplewhohavenevertraveledacrosstheAtlanticthevoyageisafantasy.Butforthepeoplewhocrossitfrequentlyo
Theapparentrigidityofmilitarydisciplineoften(i)______thesurprisinglevelofindependentthinkingexpectedofthemoder
A、Increasingfinesfortrafficviolation.B、Reducingtollsonhighways.C、Banningpublictransportpartially.D、Enlarginginsura
最新回复
(
0
)