a single 'picture element'. In a digital camera, a lens is used to form a real image on a chip with an array of the order of a million very small light-sensitive detectors, each of these corresponding to one * of the final image
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Card 8
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the square root of the mean square speed, used when quoting molecular speeds
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Card 9
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a material has this property if it does not break by snapping cleanly, and if it absorbs a lot of energy before fracture when deforming plastically. This is the opposite of brittleness
