Which of the following describes the tiny particles that make up matter?
A. They are sometimes in motion
B. They are in constant motion
C. They are never in motion

D. They are sometimes not in motion.

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?