Uncertainty Principle Using Energy and Time: A laser produces a beam of 4000-nm light. A shutter allows a pulse of light, 30 ps in duration, to pass through. What is the uncertainty in the energy of a photon in the pulse? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 2 ×10-6 eV
B. 2 ×10-5 eV
C. 2 ×10-4 eV
D. 2 ×10-3 eV
E. 2 ×10-2 eV
Answer: B
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