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The measurement of the electron position is associated with an uncertainty in momentum, which is equal to $ 1 \times 10^{-18} g\: cm\: s^{-1}$ . The uncertainty in electron velocity is, ( mass of an electron is $ 9 \times 10^{-28}g)$

$\begin {array} {1 1} (1)\;1 \times 10^{11}cm\: s^{-1} & \quad (2)\;1 \times 10^{9}cm\: s^{-1} \\ (3)\;1 \times 10^{6}cm\: s^{-1} & \quad (4)\;1 \times 10^{5}cm\: s^{-1} \end {array}$

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