MSE2020LectureNotes_1_20

MSE2020LectureNotes_1_20 - MSE 2020 Page 1 of 2...

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MSE 2020 1/20/2011 Page 1 of 2 Photoelectric effect experiment proved/demonstrated the particle property of light Threshold frequency of light below which no electrons are emitted (no photocurrent) About the threshold, increasing light intensity only increased the photocurrent (not the energy of the emitted electrons) Energy of the electrons (above threshold) was proportional to the frequency of light o = = E hv hcλ o Wave properties of light Oscillating electric and magnetic fields instead of oscillating matter like mechanical waves o = + + E E0cosKx ωt φ Electric field o = + + + = ( + + ) B B0cosKx ωt π2 φ B0sin Kx ωt φ Magnetic field o Energy density U A02 (for mechanical waves) o = ( + + ) A A0cos Kx φ ωt All particles with mass and kinetic energy have some wave properties (De Broglie) De Broglie Equation o = = mv p h → = = λ p hK2π ħK o = = = E mv22 p22m = ħ2K22m h22mλ2 Light as a probe – limited by wavelength of the light (can’t detect anything smaller than the specific light’s wavelength) o Electrons
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