The Total solution for NCERT class 6-12
The threshold frequency for a certain metalis 3.3 × 1014 Hz. If light of frequency 8.2 × 1014 Hzis incident on the metal, predict the cutoff voltage for the photoelectricemission.
Threshold frequency of the metal,
Charge on an electron, e =1.6 × 10−19 C
Planck’s constant, h =6.626 × 10−34 Js
The equation for thecut-off energy is given as:
Therefore, the cut-off voltage for thephotoelectric emission is