Uncertainty Principle Using ΔXΔp ≥ ħ: a Molecule of Roughly

question 21

Multiple Choice

Uncertainty principle using ΔxΔp ≥ ħ: A molecule of roughly spherical shape has a mass of 6.10 × 10^-25 kg and a diameter of 0.70 nm. The uncertainty in the measured position of the molecule is equal to the molecular diameter. What is the minimum uncertainty in the speed of this molecule? (ħ = 1.055 × 10^-34 J ∙ s)

• A) 0.25 m/s
• B) 2.5 m/s
• C) 25 m/s
• D) 0.025 m/s
• E) 0.0025 m/s

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