首页
登录
职称英语
【B1】 [br] 【B4】 [originaltext]A summary of the physical and chemical nature of li
【B1】 [br] 【B4】 [originaltext]A summary of the physical and chemical nature of li
游客
2024-03-04
55
管理
问题
【B1】 [br] 【B4】
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
releases
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3503362.html
相关试题推荐
[originaltext]Ifyouvisitabigcityanywhereintheworld,youwillproba
[originaltext]Ifyouvisitabigcityanywhereintheworld,youwillproba
[originaltext]M:Hey,Karen.Youarenotreallyreadingit,areyou?W:Pardon?
[originaltext]M:Hey,Karen.Youarenotreallyreadingit,areyou?W:Pardon?
[originaltext]M:Hey,Karen.Youarenotreallyreadingit,areyou?W:Pardon?
[originaltext]W:Pleasehaveaseat,MrSuanders.Ireceivedyourresumelastw
[originaltext]W:Pleasehaveaseat,MrSuanders.Ireceivedyourresumelastw
[originaltext]Therearebetween3,000and6,000publiclanguagesinthewor
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
[originaltext]DeepSpringsisanAmericancollege.Itisanunusualcollege
随机试题
Sincereturninghomewith32goldmedals,China’sOlympicchampions______(be)q
Alandfreefromdestruction,pluswealth,naturalresources,andlaborsupp
TheUnitedStatescountsitspopulationeverytenyears,andeachcensusrev
Incognitivepsychology,studiesoflearningstrategieswithfirstlanguage
对下列疾病检查有意义的试验,鉴别甲、乙型血友病A.纤维蛋白肽A测定 B.骨髓细
静止土压力P0,主动土压力Pa,被动土压力Pp三者大小关系为:()A.PP≥PO
一堆钢管,最上层有5根,最下层有21根,如果自然堆码,这堆钢管最多能堆( )根
肺癌组织大多起源于A:肺毛细淋巴管 B:肺间质 C:肺小血管上皮 D:支气
2013年单项选择:反复出现自己不能控制的动作,表现的神经症属于() A、恐惧
A公司经过公开招标,承接了建筑面积为25000m2的18层商业建筑,并
最新回复
(
0
)