In a lab a scientist tries to measure the location and speed of an electron.  The position measurements are found to have an uncertainty of 5.01 x 10-11 m (this is 0.0501 nm).  What is the smallest possible uncertainty in velocity?  An electron has a mass of 9.11 x 10-31 kg and Planck's constant is 6.63 x 10-34 J*s

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de Broglie Equation

The sketch of matter waves is drawn below: