Uncertainty Principle Using ΔEΔt ≥ ħ/2: an Ultraviolet Source Produces

question 77

Multiple Choice

Uncertainty principle using ΔEΔt ≥ ħ/2: An ultraviolet source produces a monochromatic beam of 200-nm light. A shutter allows a pulse to pass that is 10,000 wavelengths long. The uncertainty in the energy of a photon in this pulse is closest to which of the following? (ħ = 1.055 × 10^-34 J ∙ s = 6.59 × 10^-16 eV ∙ s, c = 3.00 × 10⁸ m/s)

• A) 5 × 10^-7 eV
• B) 5 × 10^-6 eV
• C) 5 × 10^-5 eV
• D) 5 × 10^-4 eV
• E) 5 × 10^-3 eV

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