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
2014-10-27
31
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.
【F5】
选项
答案
在相对粒子物理学诞生之前,人们一直以为物质的构成成分要么是不可毁灭和不可改变的基本单位,要么是可以分解为其构成部分的合成物。
解析
转载请注明原文地址:https://kaotiyun.com/show/H5K4777K
0
考研英语一
相关试题推荐
Itdoesn’tmatterwhichroomafamilychoosesto【C1】______in.It【C2】______beafavoritecomerofthekitchen,orawoodpanelled
Itdoesn’tmatterwhichroomafamilychoosesto【C1】______in.It【C2】______beafavoritecomerofthekitchen,orawoodpanelled
Itdoesn’tmatterwhichroomafamilychoosesto【C1】______in.It【C2】______beafavoritecomerofthekitchen,orawoodpanelled
FinancialTurmoilintheWorldCausesaSocialHazardDespiteadropinmetropolitanWashington’sjoblessrate,regionaleco
TheGovernmentsAggressiveDealingswithU.S.AutomakersIntheory,agovernmentbailoutshouldprovideashort-terminfusio
TheGovernmentsAggressiveDealingswithU.S.AutomakersIntheory,agovernmentbailoutshouldprovideashort-terminfusio
TeachtheKidHowtoTalktoImproveSpeechChildrenwillhavelessonsonhowtospeakproperEnglishinformalsettings,un
ThePerson’sAchievementIsMostlyDecidedbytheDayAfterTomorrowDevelopRatherThanInbornHeredity
TheGovernmentsAggressiveDealingswithU.S.AutomakersIntheory,agovernmentbailoutshouldprovideashort-terminfusi
随机试题
减少二氧化碳排放的途径主要有两条:改进能源结构和提高_______。
具有"温化痰饮"功用的方剂是
A、意识丧失是由于大脑半球弥散性损害B、意识丧失是由于广泛性发作脑功能紊乱C、意识丧失是由于上行网状结构供血不足D、意识丧失是由于广泛性一过性大脑供血不足E、意识丧失是由于间脑压迫性病变椎基底动脉供血不足
老年人患病的特点是
没有被剥夺政治权利的犯罪分子正在监狱服刑期间,有关其选举权的表述哪个是正确的?
下列对于强制性标准监督检查的表述,错误的是()。
改良土路堤填筑施工要求包括()。
2016年10月,习近平主席就加强和创新社会治理作出重要指示,强调要()。
查询“书名”字段中包含“等级考试”字样的记录,应该使用的条件是
根据域名代码规定,NET代表
最新回复
(
0
)