Experiment: Planck?s constant (115 V 50/60 Hz)

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Objective: Determine Planck?s constant using the decelerating voltage method In a modified version of a classic set up light of known frequency passes through a ring shaped anode to collide with a cathode where it causes electrons to be released due to the photo electric effect. The energy of the electrons can be determined by applying a decelerating voltage which compensates for the flow of electrons towards the anode until no electrons are flowing. This demonstrates that the cut off value of the decelerating voltage which corresponds to a current of zero is not dependent on the intensity of the light. The energy of the electrons is therefore similarly independent of intensity. By obtaining the cut off voltages for light of varying frequency it is possible to calculate Planck?s constant.

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