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What is the maximum wavelength (in nm) of light required to produce any current via the photoelectric

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What is the maximum wavelength (in nm) of light required to produce any current via the photoelectric effect if the anode is made of copper, which has a work function of 4.7eV?

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hν0 = W = 4.7eV 

λ0 = 1,241/4.7 = 264nm

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