On the average, in a ferromagnetic domain permanent atomic magnetic moments are aligned ____ to one another
a. antiparallel
b. parallel
c. perpendicular
d. alternately parallel and antiparallel
e. randomly relative
b
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The study of the behavior of atoms and atomic particles is referred to as:
A) quantum mechanics. B) thermodynamics. C) the electromagnetic theory. D) theory of computations.
If the Moon is relatively far from Earth, so that the umbra does not reach Earth, someone directly behind the umbra will see
A) a penumbral lunar eclipse. B) a partial lunar eclipse. C) a partial solar eclipse. D) an annular eclipse. E) no eclipse.
Which observation(s) support(s) the idea that dark energy accounts for about 70% of the total mass-energy density of the universe?
A) This is just the right amount of a repulsive force to explain the observed acceleration in the expansion of the universe. B) This is just the right amount of energy, in addition to the observed matter and dark matter, to explain the pattern of temperatures in the cosmic microwave background. C) It is the right amount of energy to make the universe geometrically flat, which is mathematically easier to work with than a curved geometry. D) A and B E) B and C
How many atoms are in the alcohol molecule C2H5OH?
A) 4 B) 9 C) 3 D) 11 E) insufficient information is given