申論題

1.(10%) Quantum mechanics predicts that the energy ofthe ground state ofthe H atom is -13.6 eV. Insight into the magnitude of this quantity is gained by considering several methods by which it can be measured.

(c) (4%) Calculate the temperature required to ionize a H atom in its ground state by thermal excitation. (Hint: Recall the criterion for thermal excitation of an oscillator in Planck's theory of blackbody radiation is that hv≈k_BT, h = 6.626070 x 10^-34 m² kg/s and k_B= 1.380649 × 10^-23 m² kg s² K^-¹.