Problems
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2.1
Sketch a simple vacuum tube device and the associated circuitry for measuring Em in the photoelectric effect experiment. The electrodes can be placed in a sealed glass envelope.
Sketch the photocurrent I vs. retarding voltage V that you would expect to measure for a given electrode material and configuration. Make the sketch for several intensities of light at a given wavelength.
The work function of platinum is 4.09 eV. What retarding potential will be required to reduce the photocurrent to zero in a photoelectric experiment with Pt electrodes if the wavelength of incident light is 2440 Å? Remember that an energy of qФ is lost by each electron in escaping the surface.
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2.2 Show that the third Bohr postulate, Eq. (2–5) , is ...
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