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The measurment of the electron position is associated with an uncerrtanity in momentum, which equal to 1 x 10-18 g cm s-1.The uncertanity in electron velocity is,(mass of an electrons is 9 x 10-28 g)
1 x 108
1 x 106 cm s-1
1 x 105 cm s-1
1 x 1011 cm s-1