Laws of photoelectric effect
The detailed (previous Page) experimental
investigations of photoelectric effect revealed the following results:
i) For a given frequency of incident
light, the number of photoelectrons emitted is directly proportional to the
intensity of the incident light. The saturation current is also directly
proportional to the intensity of incident light.
ii) Maximum kinetic
energy of the photo electrons is independent of intensity of the incident
light.
iii) Maximum
kinetic energy of the photo electrons from a given metal is directly
proportional to the frequency of incident light.
iv) For a given
surface, the emission of photoelectrons takes place only if the frequency of
incident light is greater than a certain minimum frequency called the threshold
frequency.
v) There is no time lag between
incidence of light and ejection of photoelectrons.
Once photoelectric phenomenon has
been thoroughly examined through various experiments, the attempts were made to
explain it on the basis of wave theory of light.
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