A 28 g piece of metal is heated to 100. °C and then dropped into 150 g of water at 22°C. The final temperature of the system is 54°C, what is the specific heat of the metal? Pls show work :))

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?