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Unformatted text preview: materials have the same work function. Stopping voltage = photon energy in eV minus work function in eV. Analysis: In activity 1 we set up the apparatus with a photoelectric cell with a digital voltmeter attached then put a diffraction grating and converging lens in front of the cell. The mercury lamp was set up in front of all of that and turned on and set the volt meter to 2 V DC range. We adjusted the converging lens until sharp image of the white image was formed. We measured the Vs for the line spectrum of the yellow, green, blue, violet and UV light on each side of the spectrum. Using these results we then formed a graph of the Vsav Vs. frequency f....
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- Spring '08