题目内容
[物理选修3-5模块](15分)
(1)(5分)已知金属钙的逸出功为2.7eV,氢原子的能级图如图所示,一群氢原子处于量子数n=4能级状态,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241211301263777.jpg)
(2)(10分)云室处在磁感应强度为B的匀强磁场中,一静止的质量为M的原子核在云室中发生一次
衰变,
粒子的质量为m,带电量为q,其运动轨迹在与磁场垂直的平面内,现测得
粒子运动的轨道半径为R,试求在衰变过程中的质量亏损。(注:涉及动量问题时,亏损的质量可忽略不计)
(1)(5分)已知金属钙的逸出功为2.7eV,氢原子的能级图如图所示,一群氢原子处于量子数n=4能级状态,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241211301263777.jpg)
A.氢原子可能辐射6种频率的光子 |
B.氢原子可能辐射5种频率的光子 |
C.有3种频率的辐射光子能使钙发生光电效应 |
D.有4种频率的辐射光子能使钙发生光电效应 |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130141192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130141192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130141192.gif)
(1)AC
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130172753.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130172753.gif)
(1)AC
(2)令V表示
粒子的速度
BqV=
(M-m)V´=mV
△E=
mV2+
(M-m)V2=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130453701.gif)
△E=△mC2
△m=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130172753.gif)
(2)令V表示
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130141192.gif)
BqV=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130328413.gif)
△E=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130360220.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130360220.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130453701.gif)
△E=△mC2
△m=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121130172753.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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