The work function of an element is the energy required to remove an electron from the surface of the solid. The work function for palladium

Question

The work function of an element is the energy required to remove an electron from the surface of the solid. The work function for palladium is 503.7 kJ/mol (that is, it takes 503.7 kJ of energy to remove 1 mole of electrons from 1 mole of Pd atoms on the surface of Pd metal). What is the maximum wavelength of light that can remove an electron from an atom in palladium metal

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Thành Công 6 months 2021-07-11T08:00:52+00:00 1 Answers 10 views 0

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    2021-07-11T08:02:28+00:00

    Answer:

    λ = 2.38 × 10^(-7) m

    Explanation:

    We are given the work function for palladium as 503.7 kJ/mol.

    Now let’s convert this to KJ/electron.

    We know from avogadro’s number that;

    1 mole of electron = 6.022 × 10^(23) electrons

    Thus,

    503.7 kJ/mol = 503.7 × 1/(6.022 × 10^(23)) = 8.364 × 10^(-22) KJ/electron = 8.364 × 10^(-19) J/electron

    Formula for energy of a photon is;

    E = hv

    Where;

    h is Planck’s constant = 6.626 × 10^(-34) J.s

    v is velocity

    Now, v = c/λ

    Where;

    c is speed of light = 3 × 10^(8) m/s

    λ is wavelength of light.

    Thus;

    E = hc/λ

    Making λ the subject, we have;

    λ = hc/E

    λ = (6.626 × 10^(-34) × 3 × 10^(8))/(8.364 × 10^(-19))

    λ = 2.38 × 10^(-7) m

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