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The rise and fall and rise of particles From Democritus to the birth of quantum physics Since we could readily cut, tear, or break everyday matter 1 into smaller pieces, it seemed natural, since the time of Democritus, \* to suppose that matter is composed of tiny particles.The mysterious exceptions were light, and to a lesser extent, sound. Nobody was able to cut light or sound into bits. Nevertheless, Newton boldly speculated that light may consist of invisible "corpuscles."In everyday life, even the most vacant vacationers can feel, and understand, the difference between water and sand. Particles of sand have an independent existence, but a water droplet falling into the sea loses its identity forever.How water waves combine is clear. We already talked about sound waves and light waves interfering in chapter I.2, but a quick review and a picture here. When the crest of one wave meets the crest of another wave, they add to a higher crest. Similarly with troughs combining into deeper troughs. When a crest meets a trough, they more or less cancel out. Physicists say that water waves, while passing through each other, interfere (figure ).That water largely consists of empty space in

Publisher
Princeton University Press
Published
2022
Language
EN

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