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Product Information

Students can repeat the experiment that served to establish the quantum theory of radiation.
A potential is applied to a photocathode while it is being irradiated by a source of monochromatic radiation, opposing the energy of the emitted photoelectrons. The voltage required to just stop the current flow is proportional to the energy of the photo-electron.
Planck’s constant can be calculated using the slope obtained by plotting the stopping potential as a function of the reciprocal of the wavelength of the radiation.
Because the amplifier is located only a few centimeters from the photodiode (within the case), the unit can achieve a minimum detectable photocurrent sensitivity of about 5 x 10-10 A. Spectral separation is provided by red, green and blue filters (included).
A small incandescent lamp or fluorescent tube can be used, but monochromatic sources, e.g., a mercury arc or He-Ne laser, produce the best results. A full-scale meter is located on the front of the case along with two jacks, an on/off switch, and controls to zero the amplifier output and retard phototube voltage.
Over all dimensions are 9 cm x 17 cm x 10 cm high. With three-wire cord and plug for operation on 120V, AC.



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