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Sodium and copper have work functions `2.3 eV and 4.5 eV` respectively . Then the ratio of the wavelength is nearest

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Sodium and copper have work functions `2.3 eV and 4.5 eV` respectively . Then the ratio of the wavelength is nearest
A. `1:2`
B. `4:1`
C. `2:1`
D. `1:4`
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Correct Answer - C
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