题目内容

A、B两个电子都垂直于磁场方向射入一均匀磁场而作圆周运动.A电子的速率是B电子速率的两倍.设RA,RB分别为A电子与B电子的轨道半径;TA,TB分别为它们各自的周期.则

A. RA∶RB=2,TA∶TB=2
B. RA∶RB=0.5,TA∶TB=1
C. RA∶RB=1,TA∶TB=0.5
D. RA∶RB=2,TA∶TB=1

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