You Want to Make Simultaneous Measurements of the Position and Velocity

Multiple Choice

You want to make simultaneous measurements of the position and velocity of an electron that is moving in the positive-x direction.If the velocity is measured to an accuracy of 10^-7 m/s,the limit of accuracy with which you can locate the electron is approximately

A) zero
B) 6.6 $\times$ 10^-27 m
C) 4.0 m
D) 7.3 km
E) 4.0 mm