While following the steps of the scientific method, when are measurements taken?
OA Just before the hypothesis is made.
OB During the experimental stage.
OC Right after a scientific law is composed.
OD Half way through developing a theory.

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?