首页
登录
职称英语
【B1】 [br] 【B7】 [originaltext]A summary of the physical and chemical nature of li
【B1】 [br] 【B7】 [originaltext]A summary of the physical and chemical nature of li
游客
2024-03-04
49
管理
问题
【B1】 [br] 【B7】
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
wavelength
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3503365.html
相关试题推荐
[originaltext]Duringa1995roofcollapse,afirefighternamedDonaldHerbe
[originaltext]Duringa1995roofcollapse,afirefighternamedDonaldHerbe
[originaltext]AlmostallstatesinAmericahaveastatefair.Theylastfor
[originaltext]Manypeoplecatchacoldinthespringtimeorfall.Itmakes
[originaltext]W:Hey,Bob,guesswhat?I’mgoingtovisitQuebecnextsummer.[
[originaltext]W:Hey,Bob,guesswhat?I’mgoingtovisitQuebecnextsummer.[
[originaltext]W:Hey,Bob,guesswhat?I’mgoingtovisitQuebecnextsummer.[
[originaltext]Ifyouvisitabigcityanywhereintheworld,youwillproba
[originaltext]Ifyouvisitabigcityanywhereintheworld,youwillproba
[originaltext]M:Hey,Karen.Youarenotreallyreadingit,areyou?W:Pardon?
随机试题
Thefollowingdatasufficiencyproblemsconsistofaquestionandtwostateme
Collegelibrarian:Untilthreeyearsago,nonstudentsusedthelibrarywithoutc
在中国,喝茶是一种仪式(ritual),一种精致品味(refinedtaste)的展示。人们在饮茶的同时,也领略着(takedelightin)品
【B1】______[br]【B6】______[originaltext]The"standardofliving"ofanyco
Itiscommonfornewstudentstosharearoomwithotheruniversitystudents
确定材料消耗量定的基本方法包括()A.观测法 B.试验法 C.统计法 D
(2018年真题)目前我国定期发布各类债券收益率曲线的机构包括()。 Ⅰ
东北三省中,制造业的质量竞争力最强的是:A.黑龙江 B.吉林
(2019年真题)证券公司最本源的业务活动是()A.证券经纪交易 B.证
设立股份有限公司,应当有2人以上200人以下为发起人,其中,须有半数以上的发起人
最新回复
(
0
)