In a laser
a. light is amplified by stimulated emission of radiation
b. the emitted light is monochromatic
c. the emitted light is coherent
d. there is a population inversion of electrons in atoms
e. all of the above
E
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Consider a solid cube with a uniform internal charge density ?0. What kind of field does this cube create?
A. Unidirectional B. Axial C. Radial D. None of the above
A solid uniform cylinder is rolling without slipping. What fraction of its kinetic energy is rotational?
A) 1/4 B) 2/3 C) 1/3 D) 1/2 E) 3/4
Rank the electric potential energies of the systems of charges shown in Figure OQ25.9 from largest to smallest. Indicate equalities if appropriate
What does enriching uranium do?
a. Increases the percentage of radioactive uranium-235 and thus improves the probability of chain reactions. b. Increases the percentage of uranium-238 and thus improves the probability of chain reactions. c. Increases the fraction of the material that consists of plutonium. d. Increases the percentage of neutrons in the bombardment beam that attempts to set off a chain reaction. e. Increases the speed at which uranium decays into lead, i.e., decreases the half-life.