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[" 1Sodium and copper have work function...

[" 1Sodium and copper have work functions "],[2.3eV" and "4.5eV" respectively,then the "],[" ratio of the threshold wavelengths is "],[" nearest to "]

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Sodium and copper have work functions of 2.3 eV and 4.5 eV. The ratio of their corresponding threshold wavelengths will be approximately equal to