Question
The threshold frequency for a photosensitive metalis 3.3 x 1014 Hz. If light of frequency 8.2 x 1014 Hzis incident on this metal, the cut-off voltage for thephotoelectric emission is nearly\lbrack AIPMT (Mains)-2011\rbrack(1) 5 V(2) 1 V(3) 2 V(4) 3 V