A-level Physics discussion forum

GROUP RULES:
1.) Posts must be related to branches of physics.
2.) Do not paste link for new thread. Advertising posts are forbidden.
3). Posts regarding religion, even if related to physics, are forbidden.
4.) Posts regarding nationalism or politics are forbidden.
5.) Offensive posts and behavior are forbidden. This includes vulgar language and disrespect for other members.
6.) Do not post questions to which you already know the answer. This forum is not a test for members.
7.) Do not post questions that are common knowledge such as what are the SI units or the value of pi.
8.) Do not post opinion questions such as who is the father of physics or who was the greatest physicist.
9.) Since this is an international group, use of English is compulsory.