logo - 刷刷题
下载APP
【简答题】

The day after news broke of a possible revolution in physics ——particles (粒子) moving faster than light ?a scientist leading the European experiment that made the discovery calmly explained it to a standing-room- only crowd at CERN.
The physicist, Dario Auterio, did not try to explain what the results might mean for the laws of physics, let alone the broader world.After an hour of technical talk, he simply said, 'Therefore, we present to you today this difference, this unusualness.'
But what unusualness it may be.From 2009 through 2011, the massive OPERA detector (探测器)buried in a mountain in Gran Sasso, Italy, recorded subatomic particles called neutrinos ( 中微子) arriving faster than light can move in an empty space.The neutrinos generated at CERN are hardly detectably early.If confirmed, the finding would throw more than a century of physics into disorder.
'If it's correct, it's phenomenal.' said Rob Plunkett, a scientist at Fermilab, the Department of Energy physics laboratory in Illinois.'We'd be looking at a whole new set of rules' for how the universe works.Those rules would bend, or possibly break, Albert Einstein's special theory of relativity, published in 1905.Basical at the time, the theory tied together space and time, matter and energy, and set a hard limit for the speed of light, later measured to be about 186, 000 miles per second.
No experiment in 106 years had broken that speed limit.Physicists expect strict study to follow, which OPERA and CERN scientists welcomed.
Fermilab operates a similar experiment, called MINOS, that shoots neutrinos from Illinois to an underground detector in Minnesota.In 2007, MINOS discovered a just detectable amount of faster than-light neutrinos, but the permissible difference of error was too big to 'mention' , Plunkett said.
Fermilab scientists will reyze their data, which will take six to eight months.In 2013, the MINOS detector, now offline, will restart after an upgrade.It could then offer confirmation of the results.
小题1:Why are the European scientists not sure about the results of the experiment?A.Because they are so unexpected.B.Because the scientists do not believe them.C.Because the scientists are careful and calm.D.Because they are against the present law of physics.小题2:The underlined word ' phenomenal' in the fourth paragraph has the closest meaning to.A.amazingB.attractiveC.embarrassingD.sensitive小题3:The best title for the passage may be _____.A.Are the laws of physics in disorder?B.Particles faster than light; Revolution or mistake?C.Faster than light measurement: right or wrong?D.Is Einstein's theory still right today?小题4:What may be discussed in the paragraphs to follow?A.Different opinions about the experiment.B.How Albert Einstein's theory developed.C.The new rules for how the universe works.D.How Fermilab scientists will reyze their data.

举报
题目标签:微子探测器粒子
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】结冰探测器的作用

A.
探测机外有无结冰
B.
探测除冰系统的工作状况
C.
探测除冰指示系统的工作状况
D.
A,B,C都不正确

【单选题】CT探测器的作用是

A.
探测患者位置是否准确
B.
接收X线并将其转换为电信号
C.
探测扫描时有无散射线
D.
将模拟信号转变为数字信号
E.
接收X线并检测有无散射线

【单选题】关于Sprites粒子的描述错误的是()

A.
Sprites粒子在赋予纹理贴图前显示为小正方形
B.
无论摄像机的摆放角度怎样变化,总是面朝摄像机
C.
Sprites粒子不能调入外部贴图
D.
如果纹理图片有Alpha通道,则Sprites粒子就使用图像的透明属性

【单选题】近代粒子物理学研究表明,物质构成的最小单元是( )。

A.
分子和原子
B.
原子核和中子
C.
原子核和亚原子
D.
夸克和轻子

【简答题】当特征福射通过试样燕气时,被下列哪种粒子吸收: A.激发态原子A. 离子

B.
基态原子
C.
分子
D.
:C
E.
r>4、在原子分光光度计中,最广泛采用的光源是:
F.
空心阴极灯
G.
无极放电灯
H.
氢灯
I.
钨灯

【单选题】探测器的作用是

A.
探测患者位置是否准确
B.
接收 X线并将其转换为电信号
C.
探测扫描时有无散射线
D.
将模拟信号转变为数字信号
E.
将微弱的电流进行放大