Photovoltaics is a method change solar
energy to electrical energy using Photoelectric Effect. Photoelectric Effect is
first discovered by Einstein in 1905. He claims
that light is not only wave, but also particle, and the energy of light has negative
correlation with the wavelength.
Electrons in metal plate get energy from sun, if the electron’s
energy is more than the limitation of the energy barrier of metal plate, it
will escape from the metal plate.
There is four light below, which one have more possibility to
escape from the same metal plate?