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1问题的提出在粒子物理研究中,可让粒子通过施加了匀强磁场的云室使云室中的气体电离来显示出它们的运动轨迹,如图1所示.若有些粒子在云室中运动时的能量减少忽略不计,则可以看到图1中的圆形轨迹,若有的粒子在运动过程中能量降低明显,则速度减小,半径减小,轨迹将呈现图1中的螺旋形曲线[1].带电粒子在施加匀强磁场的云室中做螺旋线运动时,若将云室气体对带电粒子的作用力看成
1 PROBLEM PROBLEM In particle physics, particles are allowed to pass through a cloud chamber with a uniform magnetic field to ionize the gas in the cloud chamber to show their trajectories, as shown in Figure 1. If some particles are in the cloud chamber When the energy of exercise is neglected, the circular trajectory in Fig. 1 can be seen. If some particles have obvious energy reduction during the movement, the velocity decreases and the radius decreases. The trajectory will show the spiral Curve [1]. Charged particles in the uniform magnetic field in the cloud chamber helical movement, if the cloud chamber gas on the charged particles of the force as