The photoelectric current from \( \mathrm{Na} \) (work function \( =\mathrm{W}_{0} \) \( =2.3 \m...

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The photoelectric current from \( \mathrm{Na} \) (work function \( =\mathrm{W}_{0} \) \( =2.3 \mathrm{eV} \) ) is stopped by the output voltage of the cell \( \mathrm{Pt}(\mathrm{s}) \mid \mathrm{H}_{2}(\mathrm{~g}, 1 \) bar) \( \mid \mathrm{HCl}( \) aq., \( \mathrm{pH}=1)|\operatorname{AgCl}(\mathrm{s})| \mathrm{Ag}(\mathrm{s}) \). The \( \mathrm{pH} \) of aq. \( \mathrm{HCl} \) required to stop the photoelectric current from \( \mathrm{K}\left(\mathrm{w}_{0}=2.25 \mathrm{eV}\right) \), all other conditions remaining the same, is \( \times 10^{-2} \) (to the nearest integer).
Given, \( 2.303 \frac{\mathrm{RT}}{\mathrm{F}}=0.06 \mathrm{~V} ; \mathrm{E}_{\mathrm{AgCl} \mathrm{Ag} \mid \mathrm{Cl}^{-}}^{0}=0.22 \mathrm{~V} \)
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