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a beam of photons strikes a photoelectric cell with a work function of 2.5 eV, causing...

a beam of photons strikes a photoelectric cell with a work function of 2.5 eV, causing electrons to be emitted. The electrons hit a cathode which completes a circuit with the cell. The total resistance of the circuit is 4 ohm and an anmeter measures a current of 5A. what is the energy of the photons striking the photoelectric cell?

if light with a frequency of 1*10^15 hz falls on the sodium in the previous problem, what is the maximum kinetic energy of the photoelectrons?

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