Laws of photo electric effect : The laws of photo electric effect are----
- The number of electrons emitted per second will be directly proportional to the intensity of radiated light.
Number
of photo electrons α intensity of
incident light
Number of photo electrons α photo electric
current- There is a lower limit of frequency called threshold frequency below it no emission takes place however high the intensity of the incident radiation. So that ---
E
> W₀ , ν > ν₀ and λ
< λ₀
- Above threshold frequency the maximum velocity with which electrons emerges is dependent on the frequency and not on the intensity of the radiated light.
½
mv2max α ν
- The emission of photo electron is an instantaneous process. It means time difference between incidence of light and emission of photo electron is very small may be less than even 10-9 second.{no time lag}
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