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The Time FactorAuthor: J.B. Hoag
Suppose the light which falls on the cathode were turned on and off successively at an increasing rate; then, in the case of a gas-filled photoelectric tube, it would be found that the photoelectric current gradually decreased, by as much as 20 per cent when the frequency is raised to 10,000 cycles per second. This is due to the gas and not to any time delay of emission of the photoelectrons from the cathode.
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