Published by:
CGP EDU Academic Team
Published on: August 13, 2026
The photoelectric current from Na (work function, 
) is stopped by the output voltage of the cell
The pH of aq. HCl required to stop the photoelectric current from K 
, all other conditions remaining the same, is 
(to the nearest integer).
Given: 
Text Solution
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142
Wok function of Na metal 
KE of photoelectron 
Energy of incident radiation 
Also energy of incident radiation for K metal 
Work function of K metal 
KE of photoelectrons 
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