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10.质子()和α ()粒子的电荷量之比是1︰2,质量之比是1︰4,以相同的速率在同一匀强磁场中做匀速圆周运动,轨道半径分别为RH和RHe,周期分别为TH和THe,则
A. RH︰RHe = 1︰2,TH︰THe= 1︰1
B. RH︰RHe = 1︰1,TH︰THe = 1︰1
C. RH︰RHe = 1︰1,TH︰THe = 1︰2
D. RH︰RHe = 1︰2,TH︰THe = 1︰2