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If a 400 MHz spectrometer is used at room temperature (298K), what is the equilibrium distribution between alpha and beta spins of hydrogen nuclei?

Define nuclear spin. Is spin the same as rotation? If not, what is the difference?

my girlfriend and i have been dating for a little over 1 year and we love each other very much.

Okay, She works late and usually gets a ride home from another guy friend she works with. After work, they hangout until like 4 am in her apartment every time. This happens at least twice a week. I know she is not the cheating type at all. Our relationship is the first real relationship for either of us.

She is a feminist and a huge believer in equality among the sexes. The reason I bring this up is because i called her out on this issue and we talked about it. Her point was that if it were a girl she was hanging out with it wouldnt be a problem, or if it were me in her position, hanging with a girl, she wouldnt care. (double standard)

She recently told me that one night they were hanging out and it was around 3 am and she was tired and wanted him to leave. He didnt get the hint and he fell asleep on her bed. he woke up shortly after and left though.

As i mentioned before we talked about this, but i cant help but still feel a little uncomfortable about it.

my main concern is that they are hanging out so late together. i dont know, it just bugs me. Her argument was that she just so happens to get off work late and that its not a problem.

the guy friend does have a girlfriend by the way.