A low-pressure weather system comes into the city of Denver. The atmospheric pressure is 655 mmHg. If 78.0% of dry air is nitrogen, what is the partial pressure of nitrogen in this low-pressure system? Pn^2mmHg

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?