Based on observations of the cosmic microwave background, the overall composition of the universe is approximately ________
A) 1% ordinary (baryonic) matter, 99% non-ordinary (nonbaryonic) dark matter
B) 4% ordinary (baryonic) matter, 23% non-ordinary (nonbaryonic) dark matter, 73% dark energy
C) 100% ordinary (baryonic) matter
D) 15% ordinary (baryonic) matter, 85% non-ordinary (nonbaryonic) dark matter
B
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Process of Science: Astronomers have not found any stars without some heavy elements. How does this constrain theories for the formation of the first generation of stars in the Universe?
What will be an ideal response?
A 400-W computer (including the monitor) is turned on for 8.0 hours per day. If electricity costs 10ยข per kWh, how much does it cost to run the computer annually for a typical 365-day year?
A) $1200 B) $15 C) $120 D) $17 E) $150
In Figure 9.1, the time t, when P returns to the original position on the x-axis, is closest to:
A) 13 s B) 18 s C) 25 s D) 35 s E) 50 s
Most cosmologists favor the Big Bang theory over other cosmological theories because of
a. a 3-to-1 ratio of hydrogen to helium in stars and interstellar matter. b. cosmological redshifts. c. the cosmic microwave background. d. all of the above.