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
37
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
I’mwritingtoconfirmourtelephoneconversationofThursday,the7th,abou
Stereotypesaretroublesomebecausetheyareoftenindiscriminate,exhibita
下列对零余额账户用款额度的表述中正确的是()。A.该科目借方登记收到授权支
隔离栅立柱(含斜撑和门柱)产品可分为()。A.直焊缝焊接钢管立柱 B.冷
骨与关节结核发病率最高的部位是:()A.肩关节 B.膝关节 C.脊柱
(1)“晚饭后出去散步,走着走着我又走到这里来了。”简析“又”字的深层含意。
(2017年真题)首席审计官由审计委员会任命并纳入银行高级管理人员任职资格核准范
根据以上表格,回答91-95题; 2013年,批发业法人企业比零售业多(
药品包装必须按照规定印有或者贴有A.药品完全配方 B.药品标签 C.药品说明
肾功能不全患者肾功能恶化的最常见因素是A.感染 B.高血压 C.贫血 D.
最新回复
(
0
)