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
You might also like to view...
The diffraction of light by the pupil of the eye limits
A. our ability to see in the dark. B. the color response of our eyes. C. the ability of our eyes to resolve very fine details. D. our peripheral vision.
If the potential difference across the plates of a capacitor is doubled, what happens to the energy stored?
A. it stays the same B. it doubles C. it quadruples D. it halves E. it increases by a factor of 1.414
Which of the following nuclear fuels does a one-solar-mass star fuse over the course of its entire evolution?
a. hydrogen b. hydrogen and helium c. hydrogen, helium and carbon d. hydrogen, helium, carbon, and neon e. hydrogen, helium, carbon, neon, and oxygen
Which of the following do the atoms 14C and 14N have in common?
A) total number of protons and neutrons B) number of electrons C) number of neutrons D) number of protons