Physical Chemistry ACS Final questions with correct answers

What is the order of the electromagnetic spectrum from high to low energy? - Answer Gamma rays, x-rays, UV, visible, IR, microwaves, radio What transitions occur in the microwave spectrum? - Answer Rotational What transitions occur in the IR spectrum? - Answer Vibrational with accompanying rotational fine structure bands What transitions occur in the UV-vis spectrum? - Answer Electronic In quantum mechanics, energy levels exist as multiples of what number? - Answer Planck's constant, h What is the ultra-violet catastrophe? - Answer The classical mechanics equation for frequency distribution predicts that heating an object should create blackbody radiation of gamma rays of infinite intensity. How was the ultra-violet catastrophe solved? - Answer It was assumed that energy exists in discrete units as multiples of Planck's constant, h. What does classical mechanics predict about the photoelectric effect? - Answer Both the number of electrons emitted from a material and their energy should be proportional to intensity of the incident light beam