In a certain type of molecule, electronic levels i and j are separated by 2 × 10-6 eV.
(a) If the ratio of the numbers of molecules in level j and in level i is 1 : 20, what is the temperature of the system?
(b) If level k is 3 × 10-6 eV above level j, what is the ratio of the number of molecules in level k and the number in level i?