137. A laser with a power output of 2.00 mW at a 400-nm wavelength is used to project a beam of light onto a calcium photoelectrode. (a) How many photoelectrons leave the calcium surface per second? (b) What power is carried away by ejected photoelectrons, given that the work function of calcium is 2.31 eV? (c) Calculate the
137. A laser with a power output of 2.00 mW at a 400-nm wavelength is used to project a beam of light onto a calcium photoelectrode. (a) How many photoelectrons leave the calcium surface per second? (b) What power is carried away by ejected photoelectrons, given that the work function of calcium is 2.31 eV? (c) Calculate the
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Transcribed Image Text:137. A laser with a power output of 2.00 mW at a 400-nm
wavelength is used to project a beam of light onto a calcium
photoelectrode. (a) How many photoelectrons leave the
calcium surface per second? (b) What power is carried
away by ejected photoelectrons, given that the work
function of calcium is 2.31 eV? (c) Calculate the
photocurrent. (d) If the photoelectrode suddenly becomes
electrically insulated and the setup of two electrodes in the
circuit suddenly starts to act like a 2.00-pF capacitor, how
long will current flow before the capacitor voltage stops it?
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