The photoelectric threshold of a certain metal is 310 nm. The maximum kinetic energy of electrons ejected from the surface of the metal by ultraviolet light of wavelength 200 nm is
A) 2.22 eV.
B) 2.60 eV.
C) 10.2 eV.
D)12.3 eV.
E) None of these because no electrons are ejected.

Question

Quizplus · Accepted Answer

The energy of the incident light (200 nm) is greater than the work function (310 nm), so electrons are ejected. Using the photoelectric equation, the maximum kinetic energy is calculated as 2.22 eV.

The Photoelectric Threshold of a Certain Metal Is 310 Nm