1. These questions are related to the photoelectric effect. a) Explain why according to the classical wave theory, no threshold frequency is required. [PHYS0030 FINAL EXAMINATION 7/3/2022, 1400 - 1600 HRS( UTC + 8 HOURS): QUESTION IB(a)] (2 marks) (CLO1:PLO1:C2) b) Two light sources X and Y emit light of the same intensity. X emits green light and Y emits red light. Compare the (i) energy of each photon from X and Y. [PHYS0030 FINAL EXAMINATION 7/3/2022, 1400 - 1600 HRS( UTC + 8 HOURS): QUESTION 1B(b.i)] (2 marks) (CLO3:PLOI:C2) (ii) energy emitted per second from X and Y. [PHYS0030 FINAL EXAMINATION 7/3/2022, 1400- 1600 HRS( UTC + 8 HOURS): QUESTION IB(b.ii)] (2 marks) (CLO3:PLOI:C2) c) The photoelectric effect is studied using a certain metal target. The work function of the metal is 4.5 eV. The incident photons have energy of 6.0 eV. (i) What is the threshold frequency of the metal? [PHYS0030 FINAL EXAMINATION 7/3/2022, 1400 - 1600 HRS( UTC + 8 HOURS): QUESTION 1B(b.i)] (3 marks) (CLO3:PLO6:C3) (ii) What is the stopping potential for the photoelectrons? [PHYS0030 FINAL EXAMINATION 7/3/2022, 1400 - 1600 HRS( UTC + 8 HOURS): QUESTION 1B(b.ii)] (3 marks) (CLO3:PLO6:C3) 2. These questions are related to atomic structure. a) Explain the term mass defect of a nucleus. [PHYS0030 FINAL EXAMINATION 7/3/2022, 1400 - 1600 HRS( UTC + 8 HOURS): QUESTION 2B(a)] (2 marks) (CLO1:PLO1:C2) b) A certain nuclide is represented by 95X. For the nucleus, write down the (i) number of protons