Planks constant calculated from the above chart is therefore Planks constant calculated from the above chart is The slope of the above graph will give the Plank's constant divided by the electronic charge. To calculate the planks constant from the above date we plot the stopping potential vs frequency graphįrom the above figure, we can see that the curve is almost a straight line. Where V is stopping potential, h is planks constant, e is electronic charge, is frequency of incident photons and is work function of metal in electron Volts. The stopping voltages, respectively, were measured to beĭetermine the value of Planck’s constant, the threshold frequency and work function for the material. In our experiment with rubidium photo-cell, the following lines from a mercury source were used: Q: 11.28 A mercury lamp is a convenient source for studying frequency dependence of photoelectric emission since it gives a number of spectral lines ranging from the UV to the red end of the visible spectrum.
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