回旋加速器是用来加速带电粒子的装置,如图所示.它的核心部分

  回旋加速器是用来加速带电粒子的装置,如图所示.它的核心部分是两个D形金属盒,两盒相距很近,分别和高频交流电源相连接,两盒间的窄缝中形成匀强电场,使带电粒子每次通过窄缝都得到加速。两盒放在匀强磁场中,磁场方向垂直于盒底面,带电粒子在磁场中做圆周运动,通过两盒间的窄缝时反复被加速,直到达到最大圆周半径时通过特殊装置被引出。如果用同一回旋加速器分别加速氚核()和α粒子()比较它们所加的高频交流电源的周期和获得的最大动能的大小,有

A.加速氚核的交流电源的周期较大,氚核获得的最大动能也较大

B.加速氚核的交流电源的周期较大,氚核获得的最大动能较小

C.加速氚核的交流电源的周期较小,氚核获得的最大动能也较小

D.加速氚核的交流电源的周期较小,氚核获得的最大动能较大

 

答案

 B 

 

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