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
30
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
AncienttreeswithrichtalescanbefoundacrosstheUK.Theyarethesilen
[originaltext]W:Asinglecigarettesoldonastreetcornermaynotcostalot;
[originaltext]Welcometotoday’snewssegment,highlightingbusinessopport
A.效价下降B.水解反应C.升华D.结晶E.聚合反应不属于注射剂配伍所发生的物理
火灾自动报警系统进行布线时,当管路超过一定长度,应在便于接线处装设接线盒。下列部
()可以测量员工培训的技能成果。A.工作抽样 B.原始记录 C.现场观察
房地产投资活动与()经济政策息息相关。A.市场 B.微观 C.宏观 D.计
信度是指一个测验的()。多选A.稳定性 B.准确性 C.一致性 D.有效性
(2017年真题)高蛋白饮食在肠内产生氨基酸会影响其吸收、降低疗效的药物是(
2017年7月31日,甲公司录用周某担任出纳,双方口头约定了2年期劳动合同,试用
最新回复
(
0
)