首页
登录
职称英语
【B1】 [br] 【B5】 [originaltext]A summary of the physical and chemical nature of li
【B1】 [br] 【B5】 [originaltext]A summary of the physical and chemical nature of li
游客
2023-08-01
41
管理
问题
【B1】 [br] 【B5】
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun. In fact, it is 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(氦). And, in doing so, it releases 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 converted into helium in the Sun every second. This the Sun has been doing for several 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 and radio waves, only of very much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun, to be re-emitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and re-emitted. As the energy filters through the layers of the solar interior, it passes through the X-ray part of the spectrum(频谱), 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 through space, it hits the Earth.
选项
答案
Converted
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2887103.html
相关试题推荐
Thelocalgovernmenthastoabandontheplanforanewchemicalplant______(因为客
【B1】[br]【B10】[originaltext]ThethirdofMarchisanexcitingdayforlitt
【B1】[br]【B7】[originaltext]ThethirdofMarchisanexcitingdayforlittl
【B1】[br]【B5】[originaltext]ThethirdofMarchisanexcitingdayforlittl
【B1】[br]【B4】[originaltext]ThethirdofMarchisanexcitingdayforlittl
【B1】[br]【B2】[originaltext]ThethirdofMarchisanexcitingdayforlittl
[originaltext]AssettlersmovedtoCaliforniainthemid-nineteenthcentury
[originaltext]AssettlersmovedtoCaliforniainthemid-nineteenthcentury
[originaltext](Woman—AnnaMan—Jim)W:Jim,whathaveyouheardaboutthenew
[originaltext](Woman—AnnaMan—Jim)W:Jim,whathaveyouheardaboutthenew
随机试题
在法院、检察院工作的国家公职人员都是法官、检察官。
击实试验是为了获得路基土的()。A.最小孔隙率和天然稠度 B.最大干密度和最佳
下列属于公共营养师沟通能力培养的标准有( )。A.在各种场合用各种媒体有效表达
2009年小宋在某市开设了三家名称各异的房地产经纪门店,到2012年门店数量已经
细菌性痢疾的病原菌是A.葡萄球菌 B.沙门菌 C.弧菌 D.志贺菌 E.
四肢骨折愈合期主要的康复治疗方法不包括()。A.主动运动 B.等长收缩练习
(2021年12月真题)通过期货从业资格考试即获得了期货从业资格。()
《医疗事故处理条例》规定,造成患者轻度残疾、器官组织损伤导致一般功能障碍的属于A
在抽样估计中,随着样本量的增大,如果估计量的值稳定于总体参数的真值,则这个估计量
《国家广播电影电视总局建设项目管理办法》中规定,具备管理一等工程的项目建设管理机
最新回复
(
0
)