Describe the photoelectric effect.
Data for the work function energy 
of two metals are shown in the table below.
Light of wavelength 
is incident on the surface of each of the metals.
State what is meant by a photon.
Calculate the energy of a photon of the incident light.
State whether photoelectric emission will occur from each of the metals.
that is directly proportional to its frequency 
, the energy is given by the equation:
is Planck’s constant.
.
