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
83
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.
【F2】
选项
答案
某一粒子的质量相当于一定的能量,这一事实意味着该粒子不再被看作是一个静态的物体,而应该被看成是一种动态的形式。
解析
转载请注明原文地址:https://kaotiyun.com/show/TWbZ777K
0
考研英语一
相关试题推荐
Foryears,French,ItalianandAmericanluxurybrandshave【C1】______asChina’smiddleclassdevelopeda(n)【C2】______forhigh-en
Inmattersbiological,whetherlargeorsmall,itisagoodbetthatwhatCharlesDarwinsaidbackinthe19thcenturyiscorrec
Inmattersbiological,whetherlargeorsmall,itisagoodbetthatwhatCharlesDarwinsaidbackinthe19thcenturyiscorrec
Ifcomfortablyoutpacingyourrivalsisthemainmeasureofautomotiveachievement,Tesla’selectriccarisaresoundingsuccess
Picture-takingisatechniquebothforreflectingtheobjectiveworldandforexpressingthesingularself.Photographsdepicto
【F1】Breathingparticulate-laden(akasmoggy)airmaybehardeningyourarteriesfasterthannormal,accordingtoresearchpublishe
【F1】Sendingyourchildtopianoorviolinlessonsinabidtoboosttheiracademicachievementisawasteofmoney,accordingto
【F1】Ican’thelpwonderingwhatCharlesDarwinwouldthinkifhecouldsurveythestateofhisintellectualachievementtoday.2
【F1】Ican’thelpwonderingwhatCharlesDarwinwouldthinkifhecouldsurveythestateofhisintellectualachievementtoday.2
随机试题
一COPD病人,突然呼吸困难,临床高度怀疑气胸,为明确诊断首选的检查方法是()
患者男性,50岁,倦怠,四肢无力,食欲减退、腹胀、消化不良、便秘,查血钙2.8mmol/L(正常2.1~2.6mmol/L),PTH25pmol/L(正常1~10pmol/L)。该患者考虑诊断为
A、受体阻断药B、β受体阻断药C、α,β受体阻断药D、α1受体阻断药E、β1受体阻断药阿替洛尔属于
依照我国《行政复议法》的规定,对( )等实行垂直领导的行政机关和国家安全机关的具体行政行为不服的,向上一级主管部门申请行政复议。
资源税类包括资源税和城镇土地使用税,这些税种对()征收
2×15年1月1日,为奖励并激励高管,A上市公司与其管理层成员签署股份支付协议,规定如果管理层成员自当日起在A公司连续服务3年,并且公司股价每年提高10%以上,管理层成员即可获得与1万股股票同等公允价值的现金。同时作为协议的补充,公司把全体管理层成员的年薪
下列关于通缉的说法错误的是()。
如图,在图1中,互不重叠的三角形共有4个,在图2中,互不重叠的三角形共有7个,在图3中,互不重叠的三角形共有10个,则在第29个图形中,互不重叠的三角形共有几个?
Singletons,referringtothosewholivealone,arebeingcomfortedbywell-meaningfriendsandfamilyandtoldthatnothavinga
Afterdecadesofstaringatapes,FransdeWaalhaswrittenabookaboutwhathumansseewhentheywatchchimpanzees.Thesecrea
最新回复
(
0
)