We’re being asked to determine the uncertainty in the position of an electron with uncertainty in the speed of 3.5 × 103 m/s.
Recall that Heisenberg’s Uncertainty Principle states that we cannot accurately determine both the position and velocity of an electron. This means we can only know either one at any given time.
Mathematically, this is expressed as:
h = Planck’s constant (6.626 × 10–34 kg • m2/s)
Δx = uncertainty in position (in m)
Δp = uncertainty in momentum (in kg • m/s)