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
36
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, through which of the following does the energy released in the Sun pass be fore it becomes light?
选项
A、The x-ray part of the spectrum.
B、Electromagnetic space.
C、The solar surface.
D、Interplanetory space.
答案
A
解析
根据第二段第4句,“当能量通过太阳内层过滤时,它穿过光谱的射线部分最终变成光。”由此可知A项为正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3443132.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
Womenandmendiffernotonlyinphysical【B1】______andreproductivefunction
【B1】[br]【B2】A、universeB、godsC、spiritD、natureA语义衔接题,,和天文学对应的应该选A)universe“宇
Ihavebeenstudyingthenatureofthe"loweranimals"andcontrastingitwi
Ihavebeenstudyingthenatureofthe"loweranimals"andcontrastingitwi
随机试题
()删除文件()移动光标至右边一字符[br]()移动光标至屏幕右下端(
Whenamagazineforhighschoolstudentsaskeditsreaderswhatlifewouldb
Highereducationhasaresponsibilitytoprovideaworkforcewiththedesign
下列关于人乳和牛乳中矿物质的比较,正确的有( )。A.牛乳中的钙含量比人乳低
A.高渗盐水试验 B.可的松水试验 C.胰高血糖素激发试验 D.血清总T测
患者女,32岁,患急性再生障碍性贫血入院,给予丙酸睾酮治疗,应定期检查A.肝功能
根据下列材料回答问题 20081-8月,公路客运量比上年同期增长A.6
下列费用中,应计入建设工程项目投资中“生产准备费”的有()。A.生产职工培训费
安全阀的出口管道应接向安全地点,安全阀安装应满足()。A.垂直安装 B.倾角
病例摘要:患者,男性,58岁,干部,高血压史多年,不规则服药,因由半身偏瘫麻木1
最新回复
(
0
)