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
Relativity theory has had a profound influence on our picture of matter by forcing us to modify our concept of a particle in an
Relativity theory has had a profound influence on our picture of matter by forcing us to modify our concept of a particle in an
admin
2016-03-22
9
问题
Relativity theory has had a profound influence on our picture of matter by forcing us to modify our concept of a particle in an essential way.【F1】
In classical physics, the mass of an object had always been associated with an indestructible material substance, with some "stuff" of which all things were thought to be made.
Relativity theory showed that mass has nothing to do with any substance, but is a form energy. Energy, however, is a dynamic quantity associated with activity, or with processes.【F2】
The fact that the mass of a particle is equivalent to a certain of energy means that the particle can no longer be seen as a static object, but has to be conceived as a dynamic pattern.
This new view of particles was initiated by Dirac when he formulated a relativistic equation describing the behavior of electrons.【F3】
Dirac’s theory was not only extremely successful in accounting for the fine details of atomic structure, but also revealed a fundamental symmetry between matter and anti-matter.
It predicted the existence of an anti-matter with the same mass as the electron but with an opposite charge. This positively charged particle, now called the positron, was indeed discovered two years after Dirac had predicted it. The symmetry between matter and anti-matter implies that for every particle there exists an antiparticles with equal mass and opposite charge. Pairs of particles and antiparticles can be created if enough energy is available and can be made to turn into pure energy in the reverse process of destruction.【F4】
These processes of particle creation and destruction had been predicted from Dirac’s theory before they were actually discovered in nature, and since then they have been observed millions of times.
The creation of material particles from pure energy is certainly the most spectacular effect of relativity theory, and it can only be understood in terms of the view of particles outlined above.【F5】
Before relativistic particle physics, the constituents of matter had always been considered as being either elementary units which were indestructible and unchangeable, or as composite objects which could be broken up into their constituent parts.
The basic question was whether one could divide matter again and again, or whether one would finally arrive at some smallest indivisible units.
【F1】
选项
答案
在古典物理中,某一物体的质量总是与一种不可毁灭的物质相关联,这是一种构成一切物质的“东西”。
解析
转载请注明原文地址:https://kaotiyun.com/show/vKsZ777K
0
考研英语一
相关试题推荐
TheHolocaustwastheNazis’assaultontheJewsbetween1933and1945.ItculminatedinwhattheNaziscalledthe"FinalSoluti
Whilecrimeisuparoundthenationandspreadoutacrosscitiesinabroadpattern,themajorityofpeopleconvictedofcrimes
TheWarrantyHoldingsGroup,aEuropeanleaderinmechanicalbreakdowninsuranceandaresearcherandcommentatorontrendsinm
RuinsrecentlydiscoveredinsouthernPerucouldbetheancient"lostcity"ofPaititi,accordingtoclaimsthataredrawingser
AccordingtoaDepartmentofHomelandSecurityreportobtainedbyForbes,com,agroupofunnamedprivatesectorexecutivesrepr
EndangeredFish处于危险中的鱼类Writeanessayof160-200wordsbasedonthedrawing.Inyouressay,youshould1)describethedrawing
Menaregenerallybetterthanwomenontestsofspatialability,suchasmentallyrotatinganobjectthroughthreedimensionsor
Menaregenerallybetterthanwomenontestsofspatialability,suchasmentallyrotatinganobjectthroughthreedimensionsor
FromthefoundingofHarvardCollegein1636untiltheCivilWar,Americanuniversityeducationwasmostlyaboutsendingpiousa
TherearenocomprehensivestatisticstocharttheastoundingsurgeofEuropeansdemandingcosmeticsurgeryalongwithawidera
随机试题
根据领导者运用职权的方式不同,可以将领导方式分为专制、民主与放任三种类型。其中民主式领导方式的主要优点是()。
(2005)BynextJuly,Tom_____hereforfiveyears.
A、用于肺胃蕴热所致的咽部红肿、咽痛、失音声哑B、用于阴虚火旺、虚火上浮C、用于肺热阴伤所致的咽部红肿D、用于肺胃热盛所致的咽红肿痛E、用于外感风热所致的咽痛、咽干玄麦甘桔颗粒主治
根据我国票据法的规定,现金支票与转账支票的关系是()。
对经海关审定应征关税、增值税、消费税和监管手续费、船舶吨税的货物或船舶,纳税义务人应当在海关填发税费款缴纳证的次日起7日内(星期六、星期日和法定节日除外),向指定银行缴纳税费款。()
股市中常说的黄金交叉是指()。
甲公司是一家在境内外同时上市的企业,自2018年1月1日起执行财政部于2017年发布的新修订的《企业会计准则22号——金融工具确认和计量》等金融工具系列会计准则(以下简称“新准则”)。为确保新准则的有效执行,该公司于2017年11月组织会计人员进行了新准则
接收来自AaronK@sina.com的邮件。并回复该邮件,主题:来信己收到。正文内容为:来信收到,你所托之事一定办好,放心。祝好!
Mostyoungpeopleenjoysomeformofphysicalactivity.Itmaybewalking,cycling,orswimming,orinwinter,skatingorskiing
Whatisthemaintopicoftheconversation?
最新回复
(
0
)