For the three hydrogen transitions indicated below, with n being the initial state and n being the

Question:

For the three hydrogen transitions indicated below, with n being the initial state and n’ being the final state, is the transition an absorption or an emission? Which is higher, the initial state energy or the final state energy of the atom? Finally, which of these transitions involves the largest energy photon?
(a) n = 1, n’ = 3
(b) n = 6, n’ = 2
(c) n = 4, n’ = 5.