Aluminum metal has a threshold frequency corresponding to wavelength 4770 A. Calculate the photoelectric work function for aluminium and express it in eV.
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A: To find-λ0=?(K.E.)max=?Given-ϕ0=4.2 eV=4.2×1.6×10-19 JVs=3 Vc=3×108 m/sh=6.63×10-34 Jse=1.6×10-19 C
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