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A very large metal plate carries a charg...

A very large metal plate carries a charge of `Q=-1C`. The work function for the metal is `phi = 3eV` The plate is illuminated by a `60` watt light source with a wavelength `lambda` of `330nm`. How long does it take to completely discharge the plate? (Assume that every efficient photon ejects electron which is instantly removed from the sheet surface. (All photons ejected from light source fall normally on the metal plate) (`h=6.6 xx 10^(-34) m^2 kg//s`)

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