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What is the uncertainty in the electron speed

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You are conducting an experiment in which you can measure the location of individual electron collisions to within 10-10 m. What is the theoretical limit to which you can simultaneously measure the momentum of those collisions? (Use the expression of the uncertainty principle in S4.3 Quantifying the Uncertainty Principle to make your estimate.). What is the uncertainty in the electron's speed? (The electron has a rest mass of 9.1 × 10-31kg.)

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