Most of the matter in our galaxy is in the
A) solid phase.
B) liquid phase.
C) gaseous phase.
D) plasma phase.
E) none of the above
Answer: D
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Radiation Activity: Fermium-253 has a half-life of 3.00 days. A sample of fermium has 3.88 × 106 nuclei. What is the initial activity of this sample?
A. 10.4 Bq B. 10.4 kBq C. 12.9 Bq D. 12.9 kBq
A torque acting on an object tends to produce
A) equilibrium. B) rotation. C) linear motion. D) velocity. E) a center of gravity.
If we compress the entire history of the universe into one year, the Earth formed
A) in early February B) in early September C) in late December D) in late September
An electric field is produced by a
A) constant magnetic field. B) changing magnetic field. C) either a constant or a changing magnetic field. D) none of the given answers