I have been pissed off for years at the existance of h-bar and h as separate constants, where almost everywhere h-bar should be the basic constant. IIRC, this is just because the first time either was derived, it happened to be h, so that got called the quantum mechanical constant.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.