Sodium and copper have work functions $2.3$ $eV$ and $4.5$ $eV$ respectively. Then the ratio of the wavelengths is nearest to - DASH

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Question

Sodium and copper have work functions $2.3$ $eV$ and $4.5$ $eV$ respectively. Then the ratio of the wavelengths is nearest to

$1:2$

$4:1$

$2:1$

$1:4$

Solution

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