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To determine Photoelectric effect theory
To measure different voltages associated with different wavelengths of light
To determine the value of Plank’s constant.
In the year 1887, Hertz discovered that when a light of sufficient frequency is illuminated on a
metallic surface, electricity may be emitted. In 1900 Lenard identified positively the liberated
particles like electrons and their energies. He studied the fraction of the number and energy of
electrons as a function of the wavelength of the incident light and its intensity. The results from
this study were not able to be proved using the wave theory of light.
The phenomenon was not explained until Einstein with the help of Planck’s idea of radiation
comes in small quanta experimented. According to Einstein, the energy of the ejected electrons is
proportional to the energy of the incident light with a constant called work function. As the
intensity of light increases, the energy of the emitted electrons would increase. The photoelectric
effect is the emission of electrons from the surface of the metal when ...