首页
登录
职称英语
【B1】 [br] 【B9】 [originaltext]A summary of the physical and chemical nature of li
【B1】 [br] 【B9】 [originaltext]A summary of the physical and chemical nature of li
游客
2023-08-01
15
管理
问题
【B1】 [br] 【B9】
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
As the energy filters through the layers of the solar interior
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/2887107.html
相关试题推荐
[originaltext]WhenJohnWestonawokethatmorning,herememberedthathism
[originaltext]WhenJohnWestonawokethatmorning,herememberedthathism
[originaltext]WhenJohnWestonawokethatmorning,herememberedthathism
[originaltext]Janet’ssisterisaflightattendantforafamousinternation
[originaltext]Janet’ssisterisaflightattendantforafamousinternation
[originaltext]W:Tim,didyougetyourticketfortheconcertFriday?M:Itrie
[originaltext]W:Tim,didyougetyourticketfortheconcertFriday?M:Itrie
[originaltext]M:Excuseme;I’mtryingtofindmywaytoReynoldsHall.W:Reyn
[originaltext]M:Excuseme;I’mtryingtofindmywaytoReynoldsHall.W:Reyn
【B1】[br]【B9】[originaltext]Thehomesecretary,CharlesClarke,willtoday
随机试题
WhowastoblameforstartingtheColdWar?FornearlyagenerationafterW
颅脑外伤病人的麻醉处理,下列哪些正确A.病人多伴有颅内高压,应积极予降颅压处理
碎石的公称最大粒径通常比最大粒径小一个粒级。()
下列情形中,不属于《企业国有资产交易监督管理办法》规定的企业国有资产交易行为的是
下列除哪项外,均是舌颤动的病因?( )A.气血两虚 B.亡阳伤津 C.热极
下列哪项不是猪苓的特征A.呈不规则条形、块状或者扁块状B.表面灰黑色或棕黑色,有
女性,32岁。发现持续性高血压3年,血压为150~160/90~100mmHg,
女,16岁。心悸,多汗,手颤2个月。无明显突眼,甲状腺I°弥漫性肿大。血游离T
关于缺氧和co2潴留对机体影响的比较,错误的是 A.两者都可有肺通气量增加B
下列工程资料中,可以作为承包人向业主索赔依据的是( )。A.变更指令 B.承
最新回复
(
0
)