Heisenberg Uncertainty Principle

Calculate the uncertainty in position of an electron that has been accelerated across a potential difference of 100 kV +/- 100 V.

Hints: Derive an expression for the momentum as a function of the voltage (potential difference) and differentiate. Also dV may be represented by the uncertainty in the voltage (i.e. +/- 100 volts = 200 V)

Relationship between kinetic energy and voltage : E_k = V*q