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The photoelectric current from \( \mathrm{Na} \) (work function, \( \mathrm{w}_{0}= \)
\( \mathrm{P} \) \( 2.3 \mathrm{eV}) \) is stopped by the output voltage of the cell

W. \( \mathrm{Pt}(\mathrm{s}) \mid \mathrm{H}_{2} \) (g, 1 bar) \( |\mathrm{HCl}(\mathrm{aq} ., \mathrm{pH}=1)| \operatorname{AgCl}(\mathrm{s}) \mid \operatorname{Ag}(\mathrm{s}) \).
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).
[JEE Main-2020 (September)]
Given, \( 2.303 \frac{\mathrm{RT}}{\mathrm{F}}=0.06 \mathrm{~V} ; \mathrm{E}_{\mathrm{Agc||} \mathrm{Ag} \mid \mathrm{Cl}^{-}}^{0}=0.22 \mathrm{~V} \)
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