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| This innocuous looking relationship tells us that at the heart of physical systems there is unavoidable uncertainty. This example tells us that the product of measurements of position (Dx) and momentum (Dp) must be bigger than a finite size. Consequently if position is known very accurately then the corresponding uncertainty of the object's momentum will be very large. Energy (DE) and Time (Dt) are another pair of quantities that obey this remarkable principle. |
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