137. A laser with a power output of 2.00 mW at a 400-nmwavelength is used to project a beam of light onto a calciumphotoelectrode. (a) How many photoelectrons leave thecalcium surface per second? (b) What power is carriedaway by ejected photoelectrons, given that the workfunction of calcium is 2.31 eV? (c) Calculate thephotocurrent. (d) If the photoelectrode suddenly becomeselectrically insulated and the setup of two electrodes in thecircuit suddenly starts to act like a 2.00-pF capacitor, howlong will current flow before the capacitor voltage stops it?

(b) Given: The power output of the laser is 2.00 mW. The wavelength of the laser is 400 nm.…

Answered: 137. A laser with a power output of…

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