The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be

$2900 \circ A$

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$2500 \circ A$

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$5380 \circ A$

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$2000 \circ A$

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Solution

The correct option is C
$5380 \circ A$

$W_{0} = \frac{12375}{2.3} = 5380 \circ A$

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