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Calculate the work function of a metal in \( \mathrm{eV} \), if its threshold wavelength is \( 6...
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Calculate the work function of a metal in \( \mathrm{eV} \), if its threshold wavelength is \( 6800 \AA \) and \( h=6.62 \times 10^{-34} \mathrm{~J} \mathrm{~s} \).