If a surface has a work function of 1.5 eV and photons of energy 2.7 eV are shone on the surface, what is a possible kinetic energy of the electrons emitted from the surface?
A)3.0 eV
B)2.0 eV
C)4.0 eV
D)1.0 eV
E)No electrons are emitted.

Question

Quizplus · Accepted Answer

The kinetic energy of emitted electrons is given by the difference between the photon energy and the work function: 2.7 eV - 1.5 eV = 1.2 eV. Since 1.0 eV is the closest possible value, it is a reasonable approximation.

If a Surface Has a Work Function of 1