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
2023-12-19
24
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’s 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 San us billions upon billions of nuclei 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 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 reemitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and reemitted. At 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 Farther 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.
A simple magnifying glass, focusing the Sun’s rays, can scoarch, a piece of wood or set a scrap of paper on fire. Solar radiation can also be concentrated on a much larger scale. It can burn a hole through thick steel plate, for example, or simulate the thermal shock of a nuclear blast. It can, that is, with the help of a super reflector of the sort that has been set up by French scientists high in the Pyroness. The world’s largest solar furnace is a complex of nearly 20,000 mirrors. It can concentrate enough sunlight to create’temperatures in excess of 6000 degrees Fahrenheit.
The furnace’s appearance is as spectacular as its power. Its glittering eight - story - high reflector towers over very old houses. Anchored against a concrete office and laboratory building, the huge reflector consists of nearly 9000 separate mirrors. For the furnace to operate, these small mirrors must be adjusted so that their light will meet exactly at a focal point 59 feet in front of the giant reflector. [br] It can be inferred from the passage that the Sun’s light travels
选项
A、through solid objects in space
B、in many different directions
C、more slowly than scientists previously believed
D、further in summer than in winter
答案
B
解析
中C、D所涉及的内容在文章中没有提及,而太阳光通过太空时是穿过大气层,而没有通过太空中的固体物质。唯一可能的是太阳光在空间中不受拘束向多个方面传递。
转载请注明原文地址:https://tihaiku.com/zcyy/3286263.html
相关试题推荐
[originaltext]Goodmorning,everyone.I’mgoingtogiveabriefsummaryoft
[originaltext]Goodmorning,everyone.I’mgoingtogiveabriefsummaryoft
1.Skilltoaskquestions1)beawareofthehumannature:readinesstoanswe
ThementionofMan’svictoryoverNatureatthebeginningofthepassageistoh
ThementionofMan’svictoryoverNatureatthebeginningofthepassageistoh
Whennatureisleftalone,abalanceisreachedamongtheanimalsandplants
Materialculturereferstothetouchable,material"things"--physicalobjects
Materialculturereferstothetouchable,material"things"--physicalobjects
Materialculturereferstothetouchable,material"things"--physicalobjects
WhichofthefollowingisNOTwrittenbyEdgarAllaPoe?A、Nature.B、ToHelen.C、
随机试题
[originaltext]Whatisthebestwaytolearnalanguage?Weshouldremember
[originaltext]Alotofpeoplethinkthatculturalanthropologyisjustabo
一圆形建筑物半径为27.5m,若测量半径的误差为±1cm,则圆面积的中误差为(
招标投标阶段的混凝土工程量计量时,不予扣除的空洞截面面积是()。A、小于0.1
内果皮为镶嵌状细胞,5~8个狭长细胞为1组,以长轴作不规则方向镶嵌的药材是A.连
电力电缆的()无脱落现象,防火墙标示完好、清晰。(A)防火槽盒(B)防火涂料
男性,28岁,十二指肠球溃疡史5年,突感上腹剧痛5小时,继之全腹痛,大汗淋漓。查
甲与乙共谋杀害丙,但乙临时改变主意,并没有前往犯罪地点,最后,甲单独将丙杀害。对
下列海上风险中,属于意外事故的是()。 A.火上爆发 B.触礁 C.海啸
男,50岁,2个月来间歇性无痛性全程血尿,近3天来加重伴有血块,B型超声双肾正常
最新回复
(
0
)