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The electron crawls along very slowly. And long before it gets to the diodes other electrons flow through the diodes which then both emit light. Why? Because the electrons in front of it feels the field from the electron before the electron gets to it and they move forwards and when they move the electrons in front of them move, etc. So some other electrons ...


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The notion you should look up and learn about is the phonon. It is a quasiparticle that arises in the quantum description of acoustics in condensed matter. The description is simplest and clearest in regular lattices of atoms / quantum particles, so it doesn't work so well for sound in a gas. But phonons can be thought of as quantums of sound in solid ...


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Light rays are orthogonal trajectories to the phase fronts. A phase front is an equal phase surface of a propagating wave, so the rays are lines perpendicular to these surfaces. It is a fundamental law of geometric optics (theorem of Malus and Dupin) and is effectively equivalent, at least in an isotropic medium, to all other formulations of it (Snell's law, ...


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In a wave picture we can put an arrow at each point of the wave that points in the direction of propagation which is (normally) at right angles to the wavefront. If we string a bunch of these arrows together into a line, we get a ray. I tend to think of this as being analogous to field lines in electromagnetism. In fact you can take this analogy a bit ...


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The uncertainty principle is much more general than anything you might say about the wave-particle duality. In particular, wave-particle duality is a vague and imprecise statement about how certain types of quantum systems qualitatively behave, while the uncertainty principle is a very general and quantitative statement about the standard deviations of ...


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There is still interference at a single slit resulting in a Fraunhofer pattern. Just consider both edges of the split as starting point of a new wave. Generally you're right. But, in a single slit, the electrons could still be deflected by the atoms that make up the slit. This - I think - leaves more room for discussion than the double-slit. It is propably ...



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