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The Photoelectric Effect The purpose of this experiment is to determine he Planks constant in units of electron volts the work function F and the threshold frequency for the photochathode surface provided Three filters each having a distinct wavelength were used to carry out this experiment Utilizing these filters 4358 nm 5460 nm and 5770 nm data in voltage and current was collected as potential was selected at random points for each wavelength This data was then plotted current vs potential and stopping potential was determined Stopping potential for 4358 nm is 152 V 5460 nm is 117 V and 5770 nm is 08 V This data was then used to calculate frequency for each wavelength utilizing the equation f cl Frequency data was plotted against stopping potential as mentioned above to determine Planks constant he 362 10-15 eVs also work function F 1 V and threshold frequency fo 27 1014 Hz Under 12 error is found when compared to the theoretical value he 414 10-15 eVs for Planks constant This can be a result from the graph because the best fitting linear line is supposed to be provided in order to calculate Plancks constant This has to be very accurate and the best line was chosen to minimize error If frequency of light is increased the maximum KE of the electrons increases linearly that is KEmax hf - F If the frequency f is less than the cutoff frequency fo where hfo F no electrons will be emitted Introduction The photoelectric effect refers to the fact that when light shines in a metal surface electrons are emitted from the surface The photoelectric effect occurs in other materials also but most evident with metals It is said that electrons should be emitted when light shines on a metal surface is consistent with the electromagnetic wave theory of
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