Minimum uncertainty

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What is the minimum uncertainty in an electrons velocity if the position is known within 13 A?

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Using the Heisenberg uncertainty equation on the constants and equations sheet, the delta x will be 13 x 10^-10 m. Using the mass of an electron, 9.11E-31, we can calculate the velocity by plugging in the numbers into the equation. v >= 6.62608E-34 / (4 * pi * 13E-10 * 9.11E-31)