Thanks for your reply. Yes, you are right. And for the author's purpose the second order is enough so he omitted the three and higher order terms. I only used the theorem of momentum to understand here but forgot to do the taylor expansion to the p(t+dt).
Thanks again for your help! Good luck...
Thank you very much for your reply! Would you please check the snapshots of the book in the second floor of http://tieba.baidu.com/p/2004868633 for me? I can't insert an image or upload an attatchment. Sorry for the caused inconvenience.
In the book, it only says that the term behind the...
Snapshots from the book,
I can't not insert an image. Pleas go to the second floor of this link
http://tieba.baidu.com/p/2004868633
I promise it is clean. Thanks a lot!
Hi guys, I got a question in the solid state physics book written by ashcroft and mermin. This question is about the relationship between momentum and force.
Suppose we have an electron with momentum p(t) at time t. If there is a force f(t) acted on this electron in the ongoing infinitesimal...