首页
登录
职称英语
【B1】 [br] 【B10】 [originaltext]A summary of the physical and chemical nature of l
【B1】 [br] 【B10】 [originaltext]A summary of the physical and chemical nature of l
游客
2024-03-04
61
管理
问题
【B1】 [br] 【B10】
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
without being absorbed further by solar atoms
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3503368.html
相关试题推荐
[originaltext]InFebruarylastyear,mywifelostherjob.Justassuddenly
[originaltext]InFebruarylastyear,mywifelostherjob.Justassuddenly
[originaltext]Time!Ithinkalotabouttime.Andnotjustbecauseit’sthe
[originaltext]Time!Ithinkalotabouttime.Andnotjustbecauseit’sthe
[originaltext]Time!Ithinkalotabouttime.Andnotjustbecauseit’sthe
[originaltext]M:MissJones,couldyoutellmemoreaboutyourfirstjobwithh
[originaltext]M:MissJones,couldyoutellmemoreaboutyourfirstjobwithh
[originaltext]Obtaininggoodhealthinsuranceisarealnecessitywhileyou
[originaltext]KatherineGramgraduatedfromtheUniversityofChicagoin19
[originaltext]KatherineGramgraduatedfromtheUniversityofChicagoin19
随机试题
ComputerprogrammerBrendanTammyearned£55000ayearbydesigningnewcom
Duringthelastfewyears,therehasbeenan【B1】______increaseinthenu
下列选项中,不属于煤炭自然基本条件的是( )。A.煤具有自燃倾向性 B.有连
康复医学的主要工作内容包括()A.康复预防 B.康复功能评定 C.康复治
患者男,血清CH50升高,血小板聚集,血管出现渗出、水肿。最可能的诊断是()。
洞口土体加固技术的加固方法,下列不包括()。 A、热胀冷缩法 B、注浆
典型化脓性脑膜炎脑脊液变化是A.细胞数增高,蛋白增高,糖升高 B.细胞数增高,
某公路路堤,高度10m,在进行抗震稳定性验算时,下列说法中哪个选项是正确的?(
下列关于商业银行从事境内黄金期货交易业务从业人员资格及人数的规定,正确的有(
用人单位招用人员的禁止行为包括()。A.提供虚假招聘信息,发布虚假招聘广告
最新回复
(
0
)