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
19
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/J5K4777K
0
考研英语一
相关试题推荐
Itdoesn’tmatterwhichroomafamilychoosesto【C1】______in.It【C2】______beafavoritecomerofthekitchen,orawoodpanelled
Youshouldgooveryournotes______youcanafterclass.
______totellusthattheinterestoftheindividualshouldbesubordinatetothatofthecollective?
LatelyScanSoftwareSimplyflippingthroughabookmaynotseemlikethebestwaytoscanit,butaJapaneseresearchgroup
FinancialTurmoilintheWorldCausesaSocialHazardDespiteadropinmetropolitanWashington’sjoblessrate,regionaleco
Writeapostertoyourschoolmates,informingthemofanewbooktobereleased.Youshouldwriteabout100wordsonANSWERSHE
Studythefollowingphotocarefullyandwriteanessayinwhichyoushould1)describethephotobriefly,2)interpretthemean
NewChangesinAcademicJournelPublishingItusedtobesostraightforward.Ateamofresearchersworkingtogetherinthel
NewChangesinAcademicJournelPublishingItusedtobesostraightforward.Ateamofresearchersworkingtogetherinthel
Accordingtotheauthor,anidealmarriagelife______.Intheauthor’sopinion,adivorceisnotanevilact______.
随机试题
关于正常前列腺液中的卵磷脂小体,错误的是
以下哪项不是诊断急性胆囊炎的标准
哪种唇色多见于实热证
常用推土机的形式是()。
日记账应()打印一次,并由计算机连续编号。
假设一家银行的外汇敞口头寸如下:日元多头100,欧元多头50,港币空头80,美元空头30,则用短边法计算的总敞口头寸为()。
规模经济和边际收益递减规律所研究的是同一问题。()
下列各句,没有语病、句意明确的一句是()
苏轼的“诗中有画、画中有诗”说的是()。
Anadvanceddegreeinbusinessstudiesisnowamustforanyambitiousandfocusedexecutivehopingtoclimbthecareerladderi
最新回复
(
0
)