首页
登录
职称英语
From Dr. R. S. Scorer of Britain’s Imperial College of Science comes the la
From Dr. R. S. Scorer of Britain’s Imperial College of Science comes the la
游客
2023-11-23
21
管理
问题
From Dr. R. S. Scorer of Britain’s Imperial College of Science comes the latest theory about the cause of lightening flashes. Dr. Scorer believes the cause is hail falling through super - cooled clouds, lee particles bouncing off the falling hail acquire a positive charge and rise to the top of the cloud while the hail carries a negative charge to the bottom of the cloud.
According to Dr. Scorer, Benjamin Franklin first proved thunderclouds are charged with electricity. Later investigation showed that the tops of the clouds have a great positive charge and the bottoms a great negative charge.
When the charges become great enough to break down the insulating properties of the air, lightening flashes carry the electricity within the cloud, or from cloud to cloud, or from cloud to earth. But the question remained: how do the charges develop within the cloud?
To seek the cause, Dr. Scorer and his colleagues at the college first duplicated thundercloud currents in a liquid tank. They doubt that mixture takes place only in the tops of the clouds.
Next a study of thunderclouds over the North Atlantic showed that lightening occurs only when the air temperature around the cloud is below freezing. Particles at the top of the cloud begin to freeze, but those in the remainder of the cloud stay unfrozen although below freezing temperature.
To measure moisture, the scientists sent planes equipped with external refrigerated rods into the clouds. The idea was that moisture would freeze on the rods and could later be measured. The men found, however, that some of the moisture particles bounced off the rods. This accidental discovery set the scientists on a new course of action.
In the laboratory, S. E. Reynolds whirled a refrigerated rod through ice particles and found that the particles bounced off the rod acquired a positive charge. This was the missing link. Without hail and super-cooled clouds, he concluded there could be no lightening. [br] According to the article, Benjamin Franklin was the first to prove that _______.
选项
A、lightening is caused by hail falling through super - cooled clouds
B、thunderclouds are not charged with electricity
C、thunderclouds are charged with electricity
D、lightening was not an invention of the devil
答案
C
解析
见原文第二段第一句“According to Dr.Scorer,Benjamin Franklin first proved thunder-clouds are charged with electricity.”因此C为正确选项。
转载请注明原文地址:https://tihaiku.com/zcyy/3210829.html
相关试题推荐
PassageThree[br]Whydidmoreandmorecollegestudentsreportanxietyand
PassageTwo(1)Britain’seconomywilllosemomentumthisyearamidsqu
PassageTwo(1)Britain’seconomywilllosemomentumthisyearamidsqu
PassageThree[br]Whatdoes"sciencefictionwithequations"inPara.4ref
Today’scollegestudentsaremorenarcissisticandself-centeredthantheir
Today’scollegestudentsaremorenarcissisticandself-centeredthantheir
Today’scollegestudentsaremorenarcissisticandself-centeredthantheir
Today’scollegestudentsaremorenarcissisticandself-centeredthantheir
Today’scollegestudentsaremorenarcissisticandself-centeredthantheir
Today’scollegestudentsaremorenarcissisticandself-centeredthantheir
随机试题
HowtoWriteaThesisI.Introductionpart—writin
Itisatouchingscenethateveryparentcanimmediately__________becausetheyh
科学发明scientificinvention
Let’strytofindoutwhygettingfiberfromwholefoodsisimportantfora
关于MRI射频系统中射频线圈的分类,错误的是A.全容积线圈 B.部分容积线圈
扣球是排球技术中的一种( )A.防守技术 B.进攻技术 C.串联技术 D
患者,女性,2岁,颈部淋巴结肿大伴头晕、乏力、纳差2个月。两颌下、颈部、腋窝及腹
氯丙嗪属于A.抗精神失常药 B.全身麻醉药 C.抗癫癎药 D.镇静催眠药
症见喘促短气,言语无力,咳声低弱,自汗畏风,咽喉不利,口干面红,舌质淡红,脉象细
关于动脉粥样硬化的叙述,哪项是错误的? a.肾动脉粥样硬化时肾呈细颗粒状b.
最新回复
(
0
)