如图22-2-5所示,两个相切的圆表示一个静止的原子核发生某种衰变后

如图22-2-5所示,两个相切的圆表示一个静止的原子核发生某种衰变后产生的两种粒子在匀强磁场中的运动轨迹,可以判断(  )

图22-2-5

A.原子核发了α衰变

B.原子核发生了β衰变

C.原子核放出一个正电子

D.原子核放出一个中子

答案

B


解析:

静止的原子核发生衰变的过程动量守恒,由此可判定衰变后的新核与放出的粒子速度相反.题中两圆内切说明两粒子所受洛伦兹力的方向相同,由上述两个条件可以判断两粒子电性不同,显然是发生了β衰变.

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