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
外语
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun’s very c
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun’s very c
admin
2013-06-17
30
问题
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun’s very center. It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat. This energy is liberated at the center of the Sun as billions upon billions of nuclei of hydrogen atoms collide with each other and fuse together to form nuclei of helium, and, in doing so, release some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converts into helium in the Sun every second. This the Sun has been doing thousands of millions of years.
The nuclear energy is released at the Sun’s center as high-energy gamma radiation, a form of electro magnetic radiation like light as radio waves, only of every much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun, to be reemitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the x-ray part of the spectrum, eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space, without being absorbed further by solar atoms. A very small fraction of the Sun’s light and heat is emitted in such directions that, after passing unhindered through interplanetary space, it hits the Earth.
According to the passage, through which of the following does the energy released in the Sun pass be fore it becomes light?
选项
A、The x-ray part of the spectrum.
B、Electromagnetic space.
C、The solar surface.
D、Interplanetory space.
答案
A
解析
根据第二段第4句,“当能量通过太阳内层过滤时,它穿过光谱的射线部分最终变成光。”由此可知A项为正确。
转载请注明原文地址:https://kaotiyun.com/show/zQ07777K
0
大学英语四级
相关试题推荐
LearntoloveyourjobAreyoufamiliarwithkudzu—aprolificvinethatwrapsitselfaroundothervegetation,stranglingthe
Manyteachersbelievethattheresponsibilitiesforlearningliewiththestudents.Ifalongreadingassignmentisgiven,instr
Researchershaveestablishedthatwhenpeoplearementallyengaged,biochemicalchangesoccurinthebrainthatallowittoact
Distancelearninghasmovedfarawayfromthetraditionalcorrespondencecourse,aimedattheindividualstudentworking【S1】____
Afather’srelationshiptohischild’scurrentandfutureacademicsuccessandthelevelofhisorherdevelopmentinacademicp
Dolphinshavethepowertomakepeoplefeelbetterjustbytheirpresence,accordingtoaleadingmarinebiologist."Icanno
Modernmass-productionmethodslowerthecostofmakinggoods,andthusgiveusbettervalues.Atthesametime,Americaningenu
A、Dan.B、Donna.C、MrsMorton.D、Pete.AWho’sleavingthepartyatthemomentoftheirtalking?
Organicfarmershadfoughttopreventgenetically-engineeredcropsfrombeing【C1】______organic,anditcould【C2】______forthem.
Travelingcanbefunmadeasy.Avacationtriptoanotherpartofthecountryisespecially【C1】______whenthetravelingcond
随机试题
关于营养支持的叙述,下列错误的是()。
患儿,9岁。前牙反牙合,反覆盖浅,上牙合发育不足,ANB角﹣2°,下牙合平面角40°如果使用前方牵引矫正器,适宜的前方牵引施力点为
我国信用证为可撤销、转让的跟单信用证。
(2020年)甲公司是一家医疗行业投资机构,拟对乙医院进行投资。乙医院是一家盈利性门诊医院,其营业收入为门诊收入。营业成本包括医生及护士薪酬、药品材料成本等,近年来乙医院发展态势良好,甲公司拟于2020年末收购其100%股权,目前甲公司已完成该项目的可行性
甲、乙、丙、丁投资设立A普通合伙企业,主要经营电子科技产品。合伙人甲同他人合作经营与A普通合伙企业相竞争的业务,获得20万元的收益,同时甲的行为给合伙企业造成了10万元的损失。根据合伙企业法律制度的规定,下列表述正确的有()。
下列谱例中的低声部使用了哪种写作技法?()
班级组织60名同学一起春游,38个人想玩过山车,30个人想玩激流勇进,15个人想玩海盗船,有10个人两个游戏都想玩,有一些人三个游戏都想玩,还有3个人三个游戏都不想玩。如果将三个游戏都想玩的人平均分成两组,共有多少种不同的分法?()
foreignaffairs
一个完整的计算机系统应当包括()。
Olderpeoplewhoholdtemporaryorpart-timejobsafterretirementenjoybetterphysicalandmentalhealththanthosewhostopw
最新回复
(
0
)