A linear graph of the maximum kinetic energy of photoelectrons versus the frequency…
PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation
Problem
A linear graph of the maximum kinetic energy Kmax of photoelectrons versus the frequency f of the incident light intersects the frequency axis at 5.0×1014Hz. Which of the following best describes the physical meaning of this intersection point?
(a) It is the highest light frequency that can eject electrons; higher frequencies will not cause emission.
(b) It is the minimum light frequency required for electrons to be emitted from the metal surface.
(c) It is the frequency at which photons provide exactly enough energy to stop the emitted electrons between the plates.
(d) It is the frequency where the incident light’s intensity equals the metal’s work function.