题目内容
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405267220.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405283129.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405298203.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154053144287.jpg)
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405345616.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405329326.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405345616.gif)
(1)π
介子在磁场B
和磁场B
在作圆周运动的轨道半径分别分r
与r
,则有
r
① r
② 由轨迹可得
③
由以上三式得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405329326.gif)
(2) π
介子在磁场B
和磁场B
在作圆周运动的周期分别分T
与T
,有
⑤
⑥
π
介子回到P点所用时间
⑦
将⑤⑥代入⑦中得:t=
⑧
评分参考:①、②各1分⑨、④、⑤、⑥、⑦、⑧式各2分,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411540536193.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405376127.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405283129.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405376127.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405423123.gif)
r
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405439446.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405439458.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405454271.gif)
由以上三式得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405329326.gif)
(2) π
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411540536193.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405376127.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405283129.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405376127.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405423123.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405548525.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405563523.gif)
π
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411540536193.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405595727.gif)
将⑤⑥代入⑦中得:t=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115405345616.gif)
评分参考:①、②各1分⑨、④、⑤、⑥、⑦、⑧式各2分,
![](http://thumb2018.1010pic.com/images/loading.gif)
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