The work function for potassium is 225ev a beam with a, Ask an Expert

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The work function for potassium is 2.25eV. A beam with a wavelength of 400nm and an intensity of 10^-9W/m^2. Find

a) the maximum kinetic energy of the photelectrons.

b) the number of electrons emitted per meter squared per second from the surface, assuming 3% of the incident photons are effective in ejecting electrons.

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