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In a demonstration of the photoelectric effect, suppose that a minimum energy of 5.2×10^−19 J (3.2 eV) is required to dislodge an electron from a metal surface.
What is the minimum frequency (and longest wavelength) of radiation for which the detector registers a response?
Express your answer using two significant figures.
f_min = ______________ Hz
λ_max = ______________ nm


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