TE Enriched Sample (E)

Photoelectric Effect 1 38 7. A beam of red light falling on the cathode of a photocell yields a photoelectric current. If a beam of equal intensity but higher frequency is used, what happens to the following quantities? Assume the ratio of electrons emitted to photons absorbed remains the same. K avg : the average KE of the photoelectrons I : the magnitude of the photoelectric current K avg I A. increase increase B. increase stay the same C. increase decrease D. stay the same decrease 8. A beam of blue laser falls on the cathode of a photocell and electrons are emitted. The blue laser is then replaced by a green laser of the same intensity. Which of the following would increases as a result of the change? Assume the ratio of electrons emitted to photons absorbed remains the same. A. The max KE of the photoelectrons B. The energy of the each photon falling on the cathode C. The number of the photons falling on the cathode per second D. The magnitude of the stopping potential 9. IB Higher Level Nov 2008 Light of frequency f is incident on a clean metal surface. The maximum energy of the electrons emitted from the surface is E max . Which of the following sketch-graph best shows the variation with f of E max ? A. E max 0 f B. E max 0 f C. E max 0 f D. E max 0 f (1.1) C (1.1) C (1.2) D 10. IB Higher Level Nov 2009 Which of the following is a correct statement associated with the photoelectric effect? A. Electron emission is instantaneous. B. Electrons are only emitted if the incident light is above a certain minimum wavelength. C. The energy of the emitted electrons depends on the light intensity. D. The energy of the emitted electrons does not depend on the frequency of the incident light. 11. HKDSE 2012 Photons with energy 7 eV are incident on the cathode of a photocell. The maximum kinetic energy of the photoelectrons emitted is 4 eV. When photons of energy 4 eV are incident on the cathode, the stopping potential will be A. 0 V B. 1 V C. 2 V D. 3 V 12. HKDSE 2012 In studying the photoelectric effect, a certain metal is illuminated by ultraviolet radiation of different frequency f and the maximum kinetic energy K of the photoelectrons emitted is measured. The graph is plotted as shown. K 0 f What would happen to the graph if ultraviolet radiation of higher intensity is shone on the same metal? slope of the graph intercept of the graph on the horizontal axis A. smaller unchanged B. larger unchanged C. unchanged unchanged D. unchanged smaller 13. HKDSE 2014 When photons each of energy 3.41 eV are incident on a metal surface, the maximum kinetic energy of the photoelectrons emitted is 0.54 eV. What is the threshold frequency of this metal? A. 4.33 × 10 33 Hz B. 9.53 × 10 14 Hz C. 8.23 × 10 14 Hz D. 6.93 × 10 14 Hz (1.1) A Q2.3 (1.2) (51%) (27%) B (1.2) (21%) (64%) Q2.4 C (1.2) (23%) (52%) Q2.5 D Physics Paper 1 Q36 Physics Paper 1 Q33 Sample © United Prime Educational Publishing (HK) Limited, Pearson Education Asia Limited 2023 All rights reserved; no part of this publication may be reproduced, photocopied, recorded or otherwise, without the prior written permission of the Publishers.