问题 选择题
如图是质谱仪的工作原理示意图.粒子源(在加速电场上方,未画出)产生的带电粒子被加速电场加速后,进入速度选择器.速度选择器内相互正交的匀强磁场和匀强电场的强度分别为B和E.平板S上有可让粒子通过的狭缝P和记录粒子位置的胶片A1A2.平板S下方有强度为B0的匀强磁场.下列表述正确的是(   )

A.速度选择器中的磁场方向垂直纸面向里

B.能通过狭缝P的带电粒子的速率等于B/E

C.粒子打在胶片上的位置越靠近狭缝P,粒子的比荷(q/m)越大

D.粒子所带电荷量相同时,打在胶片上的位置越靠近狭缝P,表明其质量越大

答案

答案:C

阅读理解

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单项选择题