首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Virtually everything astronomers known about objects outside the solar system is based on the detection of photons—quanta of ele
Virtually everything astronomers known about objects outside the solar system is based on the detection of photons—quanta of ele
admin
2015-04-24
54
问题
Virtually everything astronomers known about objects outside the solar system is based on the detection of photons—quanta of electromagnetic radiation. Yet mere is another form of radiation that permeates the universe: neutrinos. With(as its name implies)no electric charge, and negligible mass, the neutrino interacts with other particles so rarely that a neutrino can cross the entire universe, even traversing substantial aggregations of matter, without being absorbed or even deflected. Neutrinos can thus escape from regions of space where light and other kinds of electromagnetic radiation are blocked by matter. Furthermore, neutrinos carry with them information about the site and circumstances of their production: therefore, the detection of cosmic neutrinos could provide new information about a wide variety of cosmic phenomena and about the history of the universe.
But how can scientists detect a particle that interacts so infrequently with other matter? Twenty-five years passed between Pauli’s hypothesis that the neutrino existed and its actual detection: since then virtually all research with neutrinos has been with neutrinos created artificially in large particle accelerators and studied under neutrino microscopes. But a neutrino telescope, capable of detecting cosmic neutrinos, is difficult to construct. No apparatus can detect neutrinos unless it is extremely massive, because great mass is synonymous with huge numbers of nucleons(neutrons and protons), and the more massive the detector, the greater the probability of one of its nucleon’s reacting with a neutrino. In addition, the apparatus must be sufficiently shielded from the interfering effects of other particles.
Fortunately, a group of astrophysicists has proposed a means of detecting cosmic neutrinos by harnessing the mass of the ocean. Named DUMAND, for Deep Underwater Muon and Neutrino Detector, the project calls for placing an array of light sensors at a depth of five kilometers under the ocean surface. The detecting medium is the seawater itself: when a neutrino interacts with a particle in an atom of seawater, the result is a cascade of electrically charged particles and a flash of light that can be detected by the sensors. The five kilometers of seawater above the sensors will shield them from the interfering effects of other high-energy particles raining down through the atmosphere.
The strongest motivation for the DUMAND project is that it will exploit an important source of information about the universe. The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars. Each of these discoveries came as a surprise. Neutrino astronomy will doubtless bring its own share of surprises.
With which of the following statements regarding neutrino astronomy would the author be most likely to agree?
选项
A、Neutrino astronomy will supersede all present forms of astronomy.
B、Neutrino astronomy will be abandoned if the DUMAND project fails.
C、Neutrino astronomy can be expected to lead to major breakthroughs in astronomy.
D、Neutrino astronomy will disclose phenomena that will be more surprising than past discoveries.
答案
C
解析
细节推断题。根据题干关键词neutrino astronomy定位到原文尾段尾句。原句中的bring its ownshare of surprises与选项C中的lead to major breakthroughs对应。故答案为C。
转载请注明原文地址:https://kaotiyun.com/show/mfLO777K
0
考博英语
相关试题推荐
Inspiteofthe______economicforecast,manufacturingoutputhasrisenslightly.
Americanwomenexperienceagreat【1】oflifestyles.A"typical"Americanwomanmaybesingle.Shemayalsobedivorcedormarried
Americanwomenexperienceagreat【1】oflifestyles.A"typical"Americanwomanmaybesingle.Shemayalsobedivorcedormarried
Americanwomenexperienceagreat【1】oflifestyles.A"typical"Americanwomanmaybesingle.Shemayalsobedivorcedormarried
Americanwomenexperienceagreat【1】oflifestyles.A"typical"Americanwomanmaybesingle.Shemayalsobedivorcedormarried
Manyobjectsindailyusehaveclearlybeeninfluencedbyscience,buttheirformandfunction,theirdimensionsandappearance
IhaveneverseenMrs.Clarkbefore,butIknowfromhermedicalchartandthereportIreceivedfromtheprecedingshiftthatt
IhaveneverseenMrs.Clarkbefore,butIknowfromhermedicalchartandthereportIreceivedfromtheprecedingshiftthatt
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand1
IthinkthatIcommitteda______inaskingherbecausesheseemedveryupsetbymyquestion.
随机试题
Itisn’toftenthatanentireindustryissymbolizedinthefigureofasinglehumanbeing,andsuchisthecasewithCanadiana
A.阳盛阴衰,阴阳失交B.心胆虚怯,心神失养,神魂不安C.肾精亏虚,髓海失养D.元气素虚,清阳不升,神明失养E.气机突然逆乱,升降乘扈,气血阴阳不相顺接厥证的主要病机为
下列设备中,只能用作输入设备的是()。
下列项目中,属于会计估计变更的有()。
根据下列资料,回答下列问题。渤海中较清洁海域面积占的比重约为()。
内部控制是指经济单位和各个组织在经济活动中建立的一种相互制约的业务组织形式和职责分工制度,其通过在单位内部采取的自我调整、约束、规划、评价和控制的一系列方法来实现经营目标,从而保护资产的安全完整,保证会计信息资料的正确可靠,确保经营方针的贯彻执行,保证经营
有三块草地,面积分别为5、6、8亩。草地上的草一样厚,而且长得一样快。第一块草地可供11头牛吃10天,第二块草地可供24只羊吃14天。如果一头牛一天吃草量等于2只羊一天的吃草量,问:第三块草地可供19头牛吃多少天?
计算积分I=|xyz|dS,其中∑为曲面z=x2+y2介于平面z=0和z=1之间的部分.
Ayoungmanwasgoingtojointhearmy(军队)andhadto【C1】______amedicalexamination.Thedoctorwassittingatadeskwhenhe
Foryearspediatriciansdidn’tworrymuchabouttreatinghypertensionintheirpatients.Afterall,kidsgrowsofast,it’shard
最新回复
(
0
)