The first excited state of Ca is reached by absorption of 422.7-nm light. (a) Find the energy

Question:

The first excited state of Ca is reached by absorption of 422.7-nm light.
(a) Find the energy difference (kJ/mol) between ground and excited states.
(b) The degeneracies are g*/g0 = 3 for Ca. Find N*/N0 at 2500 K.
(c) By what percentage will N*/N0 change with a 15-K rise in temperature?
(d) Find N*/N0 at 6 000 K.