anonymoushehe
Active Member
doesn't increasing the voltage increase the strength of the electric field between the two plates, so ejected electrons have more KE so more current should be produced orrrr
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why doesnt increasing the voltage, increase the photocurrent all the way? (2 Viewers)
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wizzkids
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Yes, increasing the voltage increases the electric field strength. You haven't specified which way around for the electric field. In the Philipp Lenard Experiment (1902) on the photoelectric effect, the applied electric field is applied to slow down and eventually stop the kinetic energy of the photoelectrons. The applied E-field vector points away from the photo-target.
The applied electric field decelerates the electrons; it is used to measure the stopping voltage, which is a measure of the maximum kinetic energy of photoelectrons. If the applied electric field is reversed, then the photoelectrons are accelerated away from the target, but this does not increase the number of photoelectrons, and it is the number of photoelectrons that determines the photocurrent.