摘要
比较了常用的两种求动力学产生相干态演化算符的解法,一种是在海森伯表象中求^S(t),使得^S+(t)^a(0)^S(t)=^a(t);另一种是利用相干态平均求解演化算符,发现第一种方法不能确定一个含时的相因子.
A simple and inexpensive stationary wave experiment is reported. It is made on a nonuniform string with linear density propotional to it′s leanth. The experiment is easy to operate and gives satisfactary result.
出处
《大学物理》
1997年第9期29-30,共2页
College Physics