The density of oil is 0.93 g/mL or 0.93 g/cm3. Based off of what you now know about the density of the rock and block, predict whether these objects would float or sink in oil.
Explain your prediction.

Rock:

Block:

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?