一质量为<img src="https://static.zxtiku.com/wangke/imgs/topic/5d13a29a366f5de4a63a6348e982a0d0.png"/>的粒子被限制在宽度为<img src="https://static.zxtiku.com/wangke/imgs/topic/2735f5487d6af3f481df451a9599c043.png"/>的一维无限深方势阱(在<img src="https://static.zxtiku.com/wangke/imgs/topic/32ee61801c54ce235a0b02550179bc75.png"/>范围内，势能函数<img src="https://static.zxtiku.com/wangke/imgs/topic/5fe1287c8599051edcaf338348224daa.png"/>)中，其基态能量为<img src="https://static.zxtiku.com/wangke/imgs/topic/b3da164b638f4e11847bbffb5f9a8d31.png"/>。若势阱的宽度变成<img src="https://static.zxtiku.com/wangke/imgs/topic/287111b31ebf4c1270c078372bab136b.png"/>，而其他条件不变，则基态能量变为