6.1 Nature of Light and the Photoelectric Effect

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    Electromagnetic Radiation

    Wavelength, Frequency, and Energy of Photons
    λν = c λ = wavelength ν = frequency c = 3.0×108m/s
    speed of light
    Ephoton = hν h = 6.626×10-34J•s
    (Planck’s constant)
    ν = frequency
    Ephoton = hc / λ h = 6.626×10-34J•s
    (Planck’s constant)
    λ = wavelength c = 3.0×108m/s
    speed of light
    electromagnetic spectrum

    What is the frequency and energy of a photon of wavelength 400nm?

    Photoelectric Effect

    K.E.electron = Ephoton - ɸ
    ɸ = work function i.e. the minimum energy to ionize an electron
    1 ejected electron per photon (if it is above the threshold)

    photoelectric effect