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
2024-07-10
23
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/3671595.html
相关试题推荐
Itisannouncedthatthelunchtimewill(shorten)______fromonehourto45minu
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
Notuntilrecently,________thecauseofthedisease.A、thesescientistsfoundB、
Accordingtothepassage,scientistsusedtothinkthattheX-rayswereproduced
Accordingtothepassage,scientistsusedtothinkthattheX-rayswereproduced
随机试题
[originaltext]M:NOW.Miss,doyoufeelallrightnow?Whathappened?W:Yes.I
Throughouthistorymanhashadtoacceptthefactthatalllivingthingsmus
ProductionManager—LasVegasDerseExhibitsisanationallyrecognizeddesig
Themerefact______mostpeoplebelievenuclearwarwouldbemaddoesnotmeant
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性:
根据阴阳属性的可分性,五脏中属于阳中之阳的脏是A.心 B.肺 C.肝 D.
血液和组织液之间进行物质交换的场所是 A.微动脉B.毛细血管前括约肌C.毛
某女,39岁。月经不调,带下,腰膝酸软,体弱,服用乌鸡白凤丸。为增其益气血、调经
绩效管理的核心在于()。A.考核 B.反馈 C.沟通 D
某企业为增值税一般纳税人,2019年12月用银行存款购入需要安装的生产设备
最新回复
(
0
)