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What is threshold frequency in photoelec...

What is threshold frequency in photoelectric emission?

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When a certain metal surface is illuminated with light of frequency v, the stopping potential for photoelectric current is V_(0) . When the same surface is illuminated by light of frequency (v)/(2) the stopping potent (V_(0))/(4) . The threshold frequency for photoelectric emission is

When light of wavelength lamda and 2 lamda are incident on a metal surface, the stopping potentials are V_(0) and V_(0)//4 respectively. If c be the velocity of light in air, find the threshold frequency of photoelectric emission.

Knowledge Check

  • The threshold frequency and the threshold wavelength of photoelectric emission from a metal surface are f_(0) and lamda_(0) . The frequency and the wavelength of incident light are f and lamda . Then

    A
    there will be no photoelectric effect if `f gt f_(0)`
    B
    there will be no photoelectric effect if `lamda gt lamda_(0)`
    C
    stopping potential `prop (f - f_(0))`
    D
    maximum kinetic energy of photoelectron `prop (lamda_(0) - lamda)`

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    What is threshold frequency in connecting with photoelectric effect?

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