The photoelectric current from Na (Work function, w = 2.3 eV) is stopped by the output voltage of th — Ionic Equilibrium Chemistry Question

Question

The photoelectric current from Na (Work function, w = 2.3 eV) is stopped by the output voltage of the cell Pt (s) H (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 = 2.25 eV), all other conditions remaining the same, is ……….. × 10 (to the nearest integer). Given, 0 2 0 –2