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
考研
Is Einstein’s General Theory of Relativity Perfect ? Familiar as it may seem, gravity remains a mystery to modem physics. De
Is Einstein’s General Theory of Relativity Perfect ? Familiar as it may seem, gravity remains a mystery to modem physics. De
admin
2013-07-08
24
问题
Is Einstein’s General Theory of Relativity Perfect ?
Familiar as it may seem, gravity remains a mystery to modem physics. Despite several decades of trying, scientists have failed to fit Einstein’s general theory of relativity, which describes how gravity holds big objects together, with the quantum mechanics (an extension of statistical mechanics based on quantum theory) he pioneered, which describes the tiny fundamental particles of which matter consists and the forces by which they interact. Recent discoveries have highlighted further problems.
Many physicists are therefore entertaining the idea that Einstein’s ideas about gravity must be wrong or at least incomplete. Showing exactly how and where the great man erred is the task of the scientists who gathered at the "Rethinking Gravity" conference at the University of Arizona in Tucson this week.
One way to test general relativity is to examine ever more closely the assumptions on which it rests, such as the equivalence principle: that gravity accelerates all objects at the same rate, regardless of their mass or composition. This principle was famously demonstrated by Galileo Galilei some 400 years ago when he simultaneously dropped cannon and musket balls, and balls made of gold, silver and wood, from the Tower of Pisa. Each appeared to hit the ground at the same time.
A more precise test requires a taller tower. In effect, researchers are sending balls all the way to the moon and back. Tom Murphy, of the University of California, San Diego, and his colleagues fire laser beams from the deserts of New Mexico at reflectors placed on the moon by American and Russian spacecraft in the late 1960s and early 1970s. They use a telescope to capture the small fraction of the light that returns. Because the speed of light is known, they can calculate the distance between the Earth and the moon from the time taken for light to pass through it.
According to general relativity, because the Earth and the moon orbit the sun, they should "fall" towards it at the same rate, in the same way as Galileo’s balls fell to the ground. By repeatedly measuring the distance between them, scientists can calculate the orbits of the Earth and the moon around the sun relative to each other. If the equivalence principle were violated, the moon’s orbit around the Earth would not appear straight, either towards or away from the sun. So far, Dr. Murphy told the conference, these experiments have merely confirmed the equivalence principle to one part in 10 trillion. Dr. Murphy and his colleagues hope that even more precise measurements could ultimately show general relativity to be only approximately correct. This would usher in a hew revolution in physics.
It is stated in Para. 1 that the theory of relativity______.
选项
A、is more a mystery than a familiarity
B、has failed Albert Einstein for years
C、seems at odds with the quantum mechanics
D、is useful in holding big things together
答案
C
解析
事实细节题。根据题干定位在第一段。该段第二句讲到科学家们无法(fall to)将爱因斯坦的广义相对论和他开创的量子力学有机地统一起来(fit)。[C]项与之完全符合。文中提到“尽管引力已不是什么新鲜事物”,说明人们对于引力这个话题很熟悉,[A]项“与其说很熟悉,不如说很神秘”与之不符;[B]项fail Einstein与原文表述不符:[D]项描述的是gravity的作用,排除。
转载请注明原文地址:https://jikaoti.com/ti/mTYRFFFM
0
考研英语一
相关试题推荐
Oneofthemostimportantresultsofresearchintoageinghasbeentopinpointthesignificanceofshort-termmemory.Thisfacul
Nowmorepeopleenjoybuyinglotterytickets.Studythefollowingchartscarefullyandwriteanarticleonthetopicoflottery.
TryingtogetAmericanstoeatahealthydietisafrustratingbusinesscanbeeasilyprovedbythefactthatWhichofthefoll
TryingtogetAmericanstoeatahealthydietisafrustratingbusiness.Eventhebest-designedpublic-healthcampaignscannots
EgyptianwinehasanextensivehistorywithinthehistoryofEgyptiancivilization.Grapeswerenot(1)_____tothelandscapeof
StephenM.Saland,chairmanoftheStateSenateEducationCommittee,isaconservativeupstateRepublican,andStevenSanders,c
LoggingisnotbannedchieflybecauseAccordingtosomescientists,Hempsarepreferabletotreeschieflybecause
Instudyingboththerecurrenceofspecialhabitsorideasinseveraldistricts,andtheirprevalencewithineachdistrict,ther
(46)TelevisionhastransformedpoliticsintheUnitedStatesbychangingthewayinwhichinformationisdistributed,byalterin
Peoplewhoaredivorced,widowed,orseparated,thesurveyconcluded,aretheleastlikelyofanygrouptotakeavacation—andt
随机试题
2013年10月1日,甲公司经批准在全国银行间债券市场公开发行10000万元人民币短期融资券,期限为1年,票面利率为5%,每张面值为10元,分次付息、到期一次还本。甲公司将该短期融资券指定为以公允价值计量且其变动计入当期损益的金融负债。该短期融资券的交易费
关于工程质量监督手续的办理,下列说法正确的是()。
患儿童某,男,9岁,上颌多个牙龋坏、脱落,要求治疗。检查:口腔卫生差,左右上Ⅵ缺失,Ⅴ残根,根尖外露,左右上6无龋。间隙管理最好采用
丙氨酸一葡萄糖循环的主要生理意义是
大型电子计算机房选择火灾探测器时,应选用:(2009,120)
下列措施中,用于防范施工合同主体纠纷的是()。
【背景资料】某事业单位全额使用国拨资金建设一片试验基地。为选择施工单位,该事业单位作为招标人委托了一家具备相应资质的招标代理机构负责招标事宜。招标工作分为三个标段进行,招标文件于2014年3月1日开始发售,投标截止时间为2014年3月25日10:
张某为一企业法定代表人,2006年取得以下收入:(1)该企业实行年薪制,张某每月发放工资3000元,年终效益工资收入为64000元;(2)转让自用小汽车一辆,原价150000元,合同标明转让价160000元;(3)为改善住房条件,7
调制解调器(Modem)的作用是______。A)将数字脉冲信号转换成模拟信号B)将模拟信号转换成数字脉冲信号C)将数字脉冲信号与模拟信号互相转换D)为了上网与打电话两不误
Extraordinarycreativeactivityhasbeencharacterizedasrevolutionary,flyinginthefaceofwhatisestablishedandproducing
最新回复
(
0
)