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
2017-06-25
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.
【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://jikaoti.com/ti/mIr7FFFM
0
考研英语一
相关试题推荐
Foryears,French,ItalianandAmericanluxurybrandshave【C1】______asChina’smiddleclassdevelopeda(n)【C2】______forhigh-en
Ifcomfortablyoutpacingyourrivalsisthemainmeasureofautomotiveachievement,Tesla’selectriccarisaresoundingsuccess
Thetechnologicalrevolutionsofthelasttwodecadeshaveplacedasevereburdenontheconceptoftechnologytransfer.Itisq
Thetechnologicalrevolutionsofthelasttwodecadeshaveplacedasevereburdenontheconceptoftechnologytransfer.Itisq
Thetechnologicalrevolutionsofthelasttwodecadeshaveplacedasevereburdenontheconceptoftechnologytransfer.Itisq
【F1】Breathingparticulate-laden(akasmoggy)airmaybehardeningyourarteriesfasterthannormal,accordingtoresearchpublishe
【F1】Sendingyourchildtopianoorviolinlessonsinabidtoboosttheiracademicachievementisawasteofmoney,accordingto
【F1】Sendingyourchildtopianoorviolinlessonsinabidtoboosttheiracademicachievementisawasteofmoney,accordingto
【F1】Ican’thelpwonderingwhatCharlesDarwinwouldthinkifhecouldsurveythestateofhisintellectualachievementtoday.2
随机试题
在法律实务中,律师工作的基础是
将公共政策目标转化为政策现实的唯一途径是________。
在WindowsXP中,下列文件名错误的是()。
治疗风寒表虚有汗常用桂枝配伍( )。
企业就其产品质量向保险公司投保的险种属于()。[2004年考题]
级数的收敛性是()。
根据FIDIC施工合同条件的约定,工程支付项目中工程量清单以外的项目有()。
下列有关控制测试目的的说法中,正确的是()。
能够划分固定资本和流动资本的资本是
三星公司基于ARM9内核的S3C2410嵌入式微处理器芯片的电源管理模块共有4种工作模式。__________【65】模式下,电源管理模块仅断开ARM内核时钟FCLK,但仍为外围硬件组件提供时钟。__________【66】模式下,电源管理模块将断开内部电
最新回复
(
0
)