题目内容
一回旋加速器,在外加磁场一定时,可把质子(
H)加速到v,使它获得动能为Ek,则能使α粒子(
He)加速到的速度为_______________,能使α粒子获得的动能为____________.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121008475135.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121008491194.gif)
v/2 Ek
设加速器D形盒半径为R,磁场磁感应强度为B.由R=
得v=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121008522447.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121008678868.gif)
所以α粒子获得的速度vα=v/2.
由动能Ek=
mv2得
×(
)2=1,所以α粒子获得的动能也为Ek.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121008506423.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121008522447.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121008678868.gif)
所以α粒子获得的速度vα=v/2.
由动能Ek=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121008694225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121008740810.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121008694225.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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