首页
登录
职称英语
A summary of the physical and chemical nature of life must begin, not on the
A summary of the physical and chemical nature of life must begin, not on the
游客
2024-02-12
26
管理
问题
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, 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, and, in doing so, release 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 converts into helium in the Sun every second. This the Sun has been doing 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 as radio waves, only of every much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun, to be reemitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the x-ray part of the spectrum, 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 unhindered through interplanetary space, it hits the Earth. [br] According to the passage, energy is released in the Sun when ______.
选项
A、helium atoms bind with each other
B、gamma radiation escapes from the spectrum
C、radiation is absorbed by helium
D、nuclei of hydrogen atoms collide
答案
D
解析
根据第一段第3句:“当亿万氢原子核互相碰撞并形成氢核时,这种能量自太阳中心被释放出来。”由此可推断D项为正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3443130.html
相关试题推荐
【B1】[br]【B3】[audioFiles]audio_eufm_j01_301(200910)[/audioFiles]nature根据上下文的意思
Womenandmendiffernotonlyinphysical【B1】______andreproductivefunction
Womenandmendiffernotonlyinphysical【B1】______andreproductivefunction
Womenandmendiffernotonlyinphysical【B1】______andreproductivefunction
Womenandmendiffernotonlyinphysical【B1】______andreproductivefunction
Womenandmendiffernotonlyinphysical【B1】______andreproductivefunction
[originaltext]Throughouthistorymanhaschangedhisphysicalenvironmenti
[originaltext]Throughouthistorymanhaschangedhisphysicalenvironmenti
[originaltext]Throughouthistorymanhaschangedhisphysicalenvironmenti
Ihavebeenstudyingthenatureofthe"loweranimals"andcontrastingitwi
随机试题
Oneofthemostcriticalproblems【C1】_____blackandotherminorityAmerican
Itcanbeinferredfromthefirstparagraphthat[br]Thereisaboomingmarket
Thevisitorsdecidedtostayinourcityfor______twodaysastheywantedtoh
毛泽东指出:“红色政权能够在白色政权包围中发生和坚持下来,并且日益发展壮大”的根
胰岛素制剂最常用的注射方式是A.皮下注射 B.肌肉注射 C.皮内注射 D.
室内消火栓设备由()组成。A.水枪 B.水带
第一次把教育学作为一门独立的学科提出的著作是()。A.《大教学论》 B.《论科
某房地产开发公司2011年12月末以500万元的熟地价取得一宗面积为3000
患者,男,49岁。症见突然四肢抽搐,项背强直,壮热神昏,谵语烦躁,皮肤发斑。宜选
关于暑期浇筑大体积混凝土的说法,正确的有()。A.选用水化热低的水泥 B.混
最新回复
(
0
)