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Bergen Community College
Physics III Lab
The Photoelectric Effect
The aim of carrying out the experiment was to investigate the photoelectric effect of light
as it strikes on the surfaces of materials. Throughout the experiment, materials with varying
spectral lines were used. The energy of the photoelectrons emitted were presented as a function of
both frequency and wavelength of the light. Moreover, the experiment was meant to enable
students understand how electrons are emitted on the surface after light strikes on the material.
Planck’s Quantum is the only theory explaining the photoelectric effect of light. According
to this theory, energy of light is always proportional to its frequency. In other words, an increase
in the energy in light results to an increase in its frequency. Therefore, the photoelectric effect was
established using the law of radiation which was established by Planck in the year 1901. According
to Planck emissions and absorption of light radiation occur as a result of transitions between energy
levels. The energy emitted as absorbed in the form of quantum of radiant energy.
During photoelectric emission, light energy hits the surface of materials causing electrons
to be emitted. An increase in the amplitude of the light from its source makes more energetic
photoelectrons to be emitted. According to the findings obtained from the new quantum model,
higher frequency light generates high energy photoelectrons. Increased intensity only increases the
number of photoelectrons emitted from the source. A...