In a photoelectric experiment using a Potasium surface, you find a stopping potential of 0.57 V for a wavelength of434 nm and a stopping potential of 2.30 V for a wavelength of 271 nm.Because this is an experiment, your value of Planck's constant will be slightly different from the official value.From these data finda) a value for Planck's constant h8.81x10-34 J . sb) the work function for Potasium2.29eVc) the cutoff wavelength for this metal541.5пт

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