Electrochemistry Part 1

The photoelectric current from Na (work function, w0=2.3 eV ) is stopped by the output voltage of the cell
Pt(s)|H2(g,1bar)|HCl(aq.pH=1) |AgCl(s)|Ag(s)
The pH of aq. HCl required to stop thephotoelectric current from K(w0=2.25eV), all other conditions remaining the same, is ______.×10−2 (to the nearest integer).

Given, 2.303

RT

F

=0.06V; E°AgCl|Ag|Cl−=0.22V