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   ocr: ch112 1985 quiz 1 page 3 3. (16 pts) The half-life of the radioactive isotope thallium-193 Is 23.0 minutes. Given a 1.00 9 sample of thls substance, calculate: (a) The Initial disintegration rate (in atoms/sec) (b) The nass of material left after 6.3 hours. 4. (25 pts) In a photoelectric experiment, sodium metal is Irradiated with light of wavelength 4000 A. (a) Calculate the frequency of the Hight (b) What is the energy per photon? (c) Calculate the kinetic energy of the eaittod photoelectron if it is know that light of wavelength 6500 A (or lass) Is needed to produca photoemission. (d) Calcu ...