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It is harder to remove a free electron from copper than from sodium. Which metal has greater work function? Which has higher threshed wavelength?

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It is harder to remove a free electron from copper than from sodium. Which metal has greater work function? Which has higher threshed wavelength?

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As it is harder to remove an electron from copper than sodium, the work function of copper is greater

As threshold wavelength is inversely proportional to the work function, its value will be more for sodium.

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