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The photoelectric current from Na (Work ...

The photoelectric current from Na (Work function, w0 = 2.3 eV) is stopped by the output voltage of the cell `Pt(s) H_(2)"(g, 1 Bar) HCl (aq. pH =1) "|AgCl (s)|Ag(s)`.
The pH of aq. HCl required to stop the photoelectric current form `K(w_(0) = 2.25 eV)`, all other conditions remaining the same, is _______ `xx10(-2)` (to the nearest integer).
Given,
`2.303(RT)/(F)=0.06V,E_(AgCl|Ag|Cl^(-))^(@)=0.22V`

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