An s state (l = 0) energy level is split into two levels by an applied magnetic field. a photon of microwave radiation having frequency 60 ghz induces a transition between the two levels. what is the magnitude of the applied magnetic field? (h = 6.626 × 10-34 j • s,

i think the answer is a, hope this is right, that would be my best guess.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me