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To determine the work function of a material of a photodiode, you measuered the maximum Knetic energy of .5 eV correwsponding to a certain wavelength. Later on, you cut down the wavelength by 50% and found the maximum kinetic energy of the photoelectrons to be 3.8eV. From this information determine
a) work function of the material, and
b) the original wavelength.

  • Physics -

    E1(max) = 0.5 eV = hc/L1 - phi
    E2(max) = 3.8 eV = 2hc/L1 - phi
    L1 = first wavelength
    L1/2 = second wavelength
    phi = work function
    3.3 eV = hc/L1
    b) Solve for L1 first
    a) Then solve for phi

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