The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1x10-18 g cm s-1. The uncertainty in electron velocity is,

(mass of an electron is 9 x 10-28 g)

(a) 1 x 109 cm s-1                     (b) 1 x 106 cm s-1

(c) 1 x 105 cm s-1                     (d) 1 x 1011 cm s-1

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Heisenberg Uncertainity Principle
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