a) Sketch a simple vacuum tube device and the associated circuitry for measuring Em in a photoelectric effect type experiment. The electrodes can be placed in a sealed glass envelope.
b) Sketch the photo current I vs. retarding voltage V the you would expect to measure for a given electrode material and configuration. Make the sketch for several intensities of light at a given wavelength
c) The work function of platinum is 4.09ev what retarding potential will be required to reduce the photocurrent to zero in a photoelectric experiment with Pt electrodes if the wavelength of the incident light is 2440 angstrom? Remember that energy of qI is lost by each electron escaping the surface.