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De Broglie's wavelength – and double slit experiment The modern double-slit experiment is a demonstration that light and matter can display characteristics of both classically defined waves and particles; moreover, it displays the fundamentally probabilistic nature of quantum mechanical phenomena. A simpler form of the double-slit experiment was performed originally by Thomas Young in 1801 (well before quantum mechanics). He believed it demonstrated that the wave theory of light was correct and his experiment is sometimes referred to as Young's experiment[1] or Young's slits. In 1924, Louis-Victor de Broglie formulated the de Broglie hypothesis, claiming that all matter, not just light, has a wave-like nature; he related wavelength (denoted as λ), and momentum (denoted as p). Double Slit. Unlike this typical interference experiment where plane waves fall on a double slit, physicists have been able to observe the interference pattern from a wave packet consisting of just two photons, measuring the effective wavelength in the process. Heisenberg's uncertainty principle – single slit experiment Heisenberg's uncertainty principle tells us that it is impossible to simultaneously measure the position and momentum of a particle with infinite precision. In our everyday lives we virtually never come up against this limit, hence why it seems peculiar. In a modern single slit experiment, a laser is shone through a narrow slit onto a screen. As the slit is made narrower, the spot on the screen also becomes narrower. But at a certain point, the spot starts becoming wider. This is because the photons of light have been so localized at the slit that their horizontal momentum must become less well defined in order to satisfy Heisenberg's uncertainty principle.