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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 hc o Wave properties of light Oscillating electric and magnetic fields instead of oscillating matter like mechanical waves o = + + E E0cosKx t Electric field o = + + + = ( + + ) B B0cosKx t 2 B0sin Kx t Magnetic field o Energy density U A02 (for mechanical waves) o = ( + + ) A A0cos Kx t All particles with mass and kinetic energy have some wave properties (De Broglie) De Broglie Equation o = = mv p h = = p hK2 K o = = = E mv22 p22m = 2K22m h22m2 Light as a probe limited by wavelength of the light (cant detect anything smaller than...
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- Spring '09