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
58
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://www.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
[originaltext]M:I’msotired,Ican’tseestraight.W:You’vebeentiredalot
Whatmakesiteasiertosharethoughts?______makesiteasiertosharethoughts
一患者行右侧腮腺浅叶和肿物切除及面神经解剖术,术中结扎腮腺导管且术后未使用负压引
下列哪项是石菖蒲不具有的A.表皮细胞类方形,外壁增厚,棕色,有的含红棕色物 B
一般药物中毒常常会出现神经系统症状中:A.昏迷B.谵妄C.惊厥D.肌纤维颤动E.
耦合电容器瓷套有开裂、破损现象的,应立即汇报调控人员,作紧急停运处理。
W房地产开发公司取得A市B县C村一块基本农田以外的耕地,拟建一经济适用住房小区,
学习一种新材料时运用联想,假借意义,对记忆亦很有帮助,这种方法被称为(
(2016年真题)某男,56岁,患高血压病服用吲达帕胺,后因血压控制不理想,自行
为了有效控制零部件的成本及质量,确保生产经营稳步进行,甲汽车制造公司推出了向上游
最新回复
(
0
)