Uncertainty Principle

• If ?px = ?py = ?pz =0 (free particle)

• then ?x = ?y = ?z = ?

• an electron has kinetic energy K = 12.0 eV

• K=(1/2)mv2 = 12.0 eV => v = 2.05 x 106 m/s

• suppose the electron is moving // x and we can measure its speed with .50% precision (one part in 200)

• what is the uncertainty in its position?

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