An electron has an intrinsic magnetic moment that we can model as being due to the electron spinning around an axis. In an external magnetic field
, in which direction will the electron’s spin angular momentum vector
point when the electron is in its lowest-energy orientation?
C. will be opposite to
.
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If a vector pointing upward has a positive magnitude, a vector pointing downward has a negative magnitude
A) True B) False
In a fusion reaction,
a) light nuclei form heavier nuclei. b) heavier nuclei disintegrate into lighter nuclei c) the breeding of more fissionable material takes place. d) the fuel used must be naturally radioactive.
A wire (length = 2.0 m, diameter = 1.0 mm) has a resistance of 0.45W. What is the resistivity of the material used to make the wire?
a. 5.6 × 10^-7 W × m b. 1.2 × 10^-7 W × m c. 1.8 × 10^-7 W × m d. 2.3 × 10^-7 W × m e. 7.1 × 10^-7 W × m
The unified model describes active galactic nuclei using
a. a supermassive black hole at the center of a normal spiral galaxy. b. a supermassive black hole surrounded by an accretion disk and dense disk of gas. c. an accretion disk around a neutron star. d. gravitational lenses to intensify the radiation coming from them. e. different lines of sight toward and dwarf irregular galaxy.