If a radioactive element has a half-life of 704 million years, and the amount of parent material remaining is one-eighth of the original amount, the specimen is about
A) 2,112,000,000 years old.
B) 1,408,000,000 years old.
C) 2,816,000,000 years old.
D) 3,520,000,000 years old.
Answer: A
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Why does the Big Bang theory predict that the cosmic microwave background should have an essentially perfect thermal radiation spectrum?
A) This radiation came from the heat of the universe itself. B) The spectrum of pure hydrogen is a perfect thermal radiation spectrum. C) The spectrum of 75 percent hydrogen and 25 percent helium is a perfect thermal radiation spectrum. D) The light from all the stars and gas in the sky averaged over the entire universe is a perfect thermal radiation spectrum. E) The first stars that formed in the universe must all have had the same temperature.
The Schwarzschild radius of a black hole depends on
A) only the mass of the black hole. B) the observationally measured radius of the black hole. C) the way in which the black hole formed. D) both the mass and chemical composition of the black hole.
The Paleocene is a(n)
a. epoch. b. era. c. eon. d. period.
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.