首页
登录
职称英语
Sparks created in a lab give off X-rays, scientists announced Monday. X-
Sparks created in a lab give off X-rays, scientists announced Monday. X-
游客
2023-09-29
36
管理
问题
Sparks created in a lab give off X-rays, scientists announced Monday.
X-rays are a byproduct(副产物) of high-energy electron discharges in the Sun, in exploding stars, and even in lightning. Many scientists did not expect sparks alone to do the trick.
Researchers at Florida Institute of Technology brought their equipment, which had detected X-rays in lightning, into the lab. Half the team expected to see X-rays and the other half did not.
In sparks of 1.5 million to 2 million volts, the researchers indeed recorded X-rays that were remarkably similar to those produced by lightning.
"This amazed us, It opens the door to answering really big questions about lightning by generating it in the lab," said team member Hamid Rassoul. "It also tells us that we have a lot’to learn about how even small sparks work."
X-rays are a form of electromagnetic radiation, on a spectrum(频谱) that runs from radio waves on the low end to gamma rays on the high end and includes visible light, too.
Scientists don’t know why lightning spawns X-rays. They theorize it involves a "runaway breakdown" of the air, in which electrons escape their normal connections and gain very large energies.
"We didn’t think X-rays could be made so easily in the air," said study leader Joseph Dwyer. "The results should allow for the detailed laboratory study of runaway breakdown, a mechanism that may play a role in thunderstorm electrification, lightning initiation and propagation, and terrestrial(地球的) gamma-ray flashes."
选项
A、making sparks in laboratory
B、discharges of high-energy electron in the Sun, in exploding stars, and in lightning
C、electrons escaping their normal connections
D、radio waves
答案
B
解析
注意题干中的词组"used to"是解题的一个关键,在文章的第二段能找到答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3055333.html
相关试题推荐
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Manyfamousscientists________atthemeetingheldinBeijingyesterday.A、turned
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
TheHRmanagerannouncedthe________ofMichaelWinskellasthedepartmentdire
[audioFiles]audio_ehaz200112_001(200112)[/audioFiles]A、Monday.B、Tuesday.C、Wed
Thescientistswantedtokeeppeople______aboutthebreakthroughintheirexpe
Accordingtothepassage,scientistsusedtothinkthattheX-rayswereproduced
Accordingtothepassage,scientistsusedtothinkthattheX-rayswereproduced
随机试题
WhichofthefollowingsentencesisINCORRECT?A、Isupposeheoughttohaveknown
Myaunttriedherbestto______thesituation,butthedamagewasalreadydone.
甲公司无发行在外的优先股,2017年初发行在外的普通股股数为10000万股,20
1,2,6,16,44,()A.66 B.84 C.88 D.12
下列有关3P试验的描述,错误的是A.测定血浆中是否存在可溶性纤维蛋白单体 B.
常用遥感图像中,()是城市遥感最常用的信息。A.微波雷达图像 B.彩色红
下列关于社区照顾模式评价的说法,错误的是()。A.社区照顾模式体现对服务对象人性
男性,60岁,咳嗽,咳痰20年,有高血压、肝炎病史。查体:BP150/83mmH
企业财务管理部门根据企业发展战略和预算期经济形势的初步预测,在决策的基础上,提出
一般纳税人发生的下列业务中,不得开具增值税专用发票的有()。A.房地产开发
最新回复
(
0
)