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> 处于静止状态的某原子核 X，发生α衰变后变成质量为 M的原子核 Y，被释放的α粒子垂直射人磁感强度为 B的匀强磁场中，测得其圆周运动的半径为 r，设α粒子质量为 m，质子的电量为 e，试求：（1）衰变后α粒子的速率和动能 E k a；（2）衰变后 Y核的速率和动能 E ky；（3）衰变前 X核的质量 Mx．

问题：

发布时间：2024-09-11

处于静止状态的某原子核 X，发生α衰变后变成质量为 M的原子核 Y，被释放的α粒子垂直射人磁感强度为 B的匀强磁场中，测得其圆周运动的半径为 r，设α粒子质量为 m，质子的电量为 e，试求：
（1）衰变后α粒子的速率和动能 E _k a；
（2）衰变后 Y核的速率和动能 E _ky；
（3）衰变前 X核的质量 M_x．

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