The density of a test tube is 2.3g/cm3. The volume of the test tube is 4 cm3. What is
the mass of the test tube?

A. 0.92 g

B. 9.2g

C. 9.3g

D. 92g

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?