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Atomic and Nuclear Physics
 
Aim: to estimate the value of Planck's Constant using the Photo-Electric Effect
See, Quantum Theory, Einstein's Photo-Electric Equation
 
Method
In this method, light is allowed to reach a photo-emissive surface (inside a photo-cell).
This causes electrons to be emitted with a range of kinetic energies.
A stopping voltage is then used to stop even the most energetic of the emitted electrons before they reach the cathode of the photo-cell.
A simplified diagram of the apparatus is shown below.
You will need colour filters for which you have detailed information concerning the range of wavelengths (or frequencies) of light they allow to pass.
 
Find the voltage, Vs needed to reduce the reading of the galvanometer to zero, with a range of different frequencies of light, f reaching the photo-cell (different coloured filters).
Einsteinís photo-electric equation can be stated as
Use this to find a value of Planckís constant, h.
 
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