HomeLearn Fast select Course
Show Unit/ChapterChange UnitChange SubjectLast Menu
NEET-XII-Physics

11: Dual Nature Of Radiation And Matter

 page 2
Qstn# 8 Prvs-QstnNext-Qstn
  • #8
    The threshold frequency for a certain metal is 3.3 × 1014 Hz. If light of frequency 8.2 × 1014 Hz is incident on the metal, predict the cutoff voltage for the photoelectric emission.
    Ans : Threshold frequency of the metal,

    Frequency of light incident on the metal,

    Charge on an electron, e = 1.6 × 10-19 C

    Planck’s constant, h = 6.626 × 10-34 Js

    Cut-off voltage for the photoelectric emission from the metal =

    The equation for the cut-off energy is given as:



    Therefore, the cut-off voltage for the photoelectric emission is