TE Enriched Sample (E)

Photoelectric Effect 1 36 Common Mistakes • f > f 0 reversed voltage reversed voltage f > f 0 I I I I Current flows in the opposite direction of the electron flow. • f > f 0 V = 0 V V = 0 V I = 0 A I ≠ 0 A f > f 0 Photoelectrons are emitted with KE, so they can reach the anode without the help of any voltage. • all KE = K max di erent KE Photoelectrons are emitted with a wide range of KE from zero to K max . • cold cathode temperature of the photocell is too low I = 0 A I = 0 A ∴ frequency of the light is too low ∴ Do not mix up the X-ray emission and the photoelectric effect. It is the X-ray emission that requires a hot cathode, not the photoelectric effect. 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.