Light Falling on the Surface of a Metal Such as Cesium

Multiple Choice

Light falling on the surface of a metal such as cesium can liberate electrons from the metal.The kinetic energy of electrons emitted from a metal can be increased by

A) using light of higher frequency.
B) using light of lower frequency.
C) increasing the intensity of the incident light.
D) using a metal with a greater work function.
E) None of these is correct.