Light A and Light B are both monochromatic and illuminate the same metal surface
PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation
Problem
Light A and Light B are both monochromatic and illuminate the same metal surface. Both lights have a frequency that is greater than the metal’s threshold frequency. Light B has twice the intensity of Light A. Which statement best describes the resulting photoelectric emission?
(a) Both lights eject electrons with the same maximum kinetic energy, and the photocurrent is also the same because current depends only on frequency.
(b) Light A and Light B produce photoelectrons with the same maximum kinetic energy, but Light B ejects a larger number of electrons per unit time.
(c) Only Light B produces photoelectrons because its higher intensity meets the emission requirement.
(d) Light B produces photoelectrons with twice the maximum kinetic energy of those from Light A, while ejecting the same number per unit time.