Photoelectric Effect (1)

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Presentation transcript:

Photoelectric Effect (1) Discovered in 1887: Light can lead to the emission of electrons from metal surfaces. Only the wavelength, not the intensity of the light matters! Heinrich Hertz 1857 - 1894 < picture from www.wikipedia.org >

Photoelectric Effect (2) Nobel Prize for Physics (1921) for explanation of the Photoelectric Effect: Light energy is quantized (see Max Planck). If the energy of a light quantum (photon) is greater than the work function of a given material, electrons will be emitted. Albert Einstein 1879 – 1955 < picture from www.wikipedia.org >

Louis Victor Pierre Raymond, Matter Waves Louis Victor Pierre Raymond, 7e Duc de Broglie (1892 - 1987) Nobel Prize for Physics, 1922 < picture from www.wikipedia.org >