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
11
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
DifferencesBetweenCulturesinNon-verbalCommunicationsI.Culturalinfluence
IwashavingdinneratarestaurantwhenHarrisoncamein.Harrisonworkedina
We______thatdietisrelatedtomosttypesofcancer,butwedon’thavedefini
某百货商场,地上6层,地下2层,层高均4m,每层建筑面积800㎡,地下部分为汽车
关于躯体感觉诱发电位的描述,下列哪项是错误的A.刺激躯体神经是在中枢记录的神经电
患者男,白细胞计数为79×109/L,中性粒细胞87%,并伴有白细胞毒性改变,疑
根据《刑事诉讼法》和《人民警察法》的有关规定,下列不属于公安机关法定职责的是:(
(2021年真题)通过监测国际标准化比值(INR)调整给药剂量的药物是()
固定桥修复后基牙松动,最适合的检查是( )。A.颞下颌关节侧位片 B.根尖片
囊性淋巴管瘤的临床表现如下,除外A:好发于儿童及青少年 B:主要发生于颈部、锁
最新回复
(
0
)