MSE2020LectureNotes_1_20

MSE2020LectureNotes_1_20 - MSE 2020 Page 1 of 2...

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Unformatted text preview: 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...
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This note was uploaded on 09/12/2011 for the course MSE 2020 taught by Professor Alamgir during the Spring '09 term at Georgia Tech.

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MSE2020LectureNotes_1_20 - MSE 2020 Page 1 of 2...

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