Question: In a photoelectric experiment using sodium, when incident light of wavelength 570 nm and intensity 1.0 W/m2 is used, the measured stopping potential is 0.28

In a photoelectric experiment using sodium, when incident light of wavelength 570 nm and intensity 1.0 W/m2 is used, the measured stopping potential is 0.28 V.
(a) What would the stopping potential be for incident light of wavelength 400.0 nm and intensity W/m2?
(b) What would the stopping potential be for incident light of wavelength 570 nm and intensity 2.0 W/m2?
(c) What is the work function of sodium?

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