作者ticketwoon ( )
看板Physics
标题[问题]
时间Sun Dec 14 20:25:08 2008
Kittel 的固态导论第三章 problem 5 第二小题
Consider a line of 2N ions of alternating charge +-q with a
repulsive potential energy A/R^n between nearest neighbors.
(a) show that at the equilibrium separation U = -2Nq^2ln2/R *(1-1/n) {CGS}
(b) let the crystal be compressed so that R -> R(1-δ). show that the work done
in compressing a unit length of the crystal has the leading term 0.5Cδ^2 ,
where C = (n-1)q^2ln2/R
第二小题我本来是用第一小题的式子来计算能量差值，之後在除以压缩的长度
可是结果似乎差异很大，所以想请问大家如何解决。谢谢！
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 61.227.192.71