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It is harder to remove a free eletron fr...

It is harder to remove a free eletron from copper than from sodium .Which metal has greater work function?Which has higher threshold waelength?

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Because work function of Copper is large than that of Sodium.
As`" " E=hv_0=(hc)/(lamda_0)`
`implies` Threshold wavelength of Sodium is more than that of Copper.
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