How to convert 5.58 deciliters to liters

If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a

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?

This statement about matter and its behavior is best classified as a