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
48
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.
【F4】
选项
答案
粒子生成和毁灭的过程在真正被发现之前,迪拉克的理论已经对它们作出了预测,从那时起人们对此做过数百万次的观测。
解析
转载请注明原文地址:https://kaotiyun.com/show/0KsZ777K
0
考研英语一
相关试题推荐
[A]BrokebackMountainisfinanciallyasuccess[B]Criticalacclaimhasbeenwon[C]Adaringbutseriousmovie[D]Agaywesterna
Maybeyou’rereadytomakesomeNewYear’sresolutions,butyou’renotoptimisticthatthisyearisgoingtobeanydifferent.M
[A]Nuclearpowerisapotentialthreattomankind[B]Thesafetyofnuclearpowerhasimproved[C]Thespreadofnuclearweaponsm
[A]Whyreadingfallsintodecline?[B]Readingisrelatedtonationalpolitics[C]Readingisastimulatingexperience[D]Reading
Youshouldthinkseriouslyaboutworkingforayearortwobeforeyougotograduateschool.Onestudentsaidthathavingworked
Cardiologistshavepioneeredtheworld’sfirstnon-surgicalbypassoperationtoturnaveinintoanarteryusinganewtechnique
FlySheetAdvertisement传单广告Writeanessayof160-200wordsbasedonthedrawing.Inyouressay,youshould1)describethedraw
TheNegativeInfluenceoftheInternetBar网吧的负面影响Studythepicturecarefullyandwriteanessayinwhichyoushould1)describe
Itwassupposedtobethenew-mediaelection.E-mail,blogging,socialnetworkingandtweetingwereexpectedtosurgeinimporta
Inthedaysbeforepreschoolacademieswereallbutmandatoryforkidsunder5,IstayedhomeandgotmyearlyeducationfromMi
随机试题
存款人违反规定将单位款项转入个人银行结算账户的,对于经营性的存款人,给予警告并处以()的罚款。
对于无法确定原产国别(地区)的进口货物,按协定税率征税。
证券的预期报酬率为12%,标准差为15%;B证券的预期报酬率为18%,标准差为20%,投资于两种证券组合的可行集是一条曲线,有效边界与可行集重合,下列结论中正确的有()。Ⅰ.最小方差组合是全部投资于A证券Ⅱ.最高预期报酬组合是全部投
A、B公司均为一般纳税企业,增值税税率为13%。A公司销售给B公司一批库存商品,应收账款为含税价款532万元,款项尚未收到。到期时B公司无法按合同规定偿还债务,经双方协商,A公司同意B公司用存货抵偿该项债务,该产品公允价值为450万元(不含增值税),成本为
下列情形中,符合土地增值税核定征收条件的有()。
下列有关审计程序不可预见性的说法中,错误的是()。
近年来投身F1赛车比赛的选手数量的增长速度大大超过了F1赛事数量的增长,加之3D模拟比赛系统的应用越来越普及,最近几年每位F1赛车选手实际参加场地F1比赛的平均次数下降了20%,这种趋势如果持续下去的话,F1赛车选手的水平肯定会大幅下降。以上论证基于以下哪
过度通货膨胀
砖面路()分隔式道路爬坡车道()桥梁管理系统
Forthefirsttimeinhistory,evolutionhastakenabackseat.Thereisanongoingrealizationthathumanbeingsarecapableof
最新回复
(
0
)