What percentage of parent isotope is remaining if 2 half lifes have elapsed?
A. 6.25%
B. 12.5%
C. 25%
D. 50%
E. 100%
Answer: C. 25%
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Fundamental to semiconductors are
A. bound electrons. B. free electrons. C. both of these in various proportions D. none of the above
With the emergence of the world-system in the 16th century, European ________ reshaped the world
A) merchant capitalism B) languages C) sports D) transnational corporations E) comparative advantages
What evidence do scientists use to estimate the density and composition of the core? What will be an ideal response?
Gasoline prices have doubled in a large Midwestern city and may continue to rise in the future. What may happen in this situation?
A) People who live in the suburbs will want larger vehicles to drive. B) People who live in the suburbs may press local politicians and city planners to develop better mass transit for the area. C) People who live in the suburbs will become active supporters of increased mass transit options. D) Some people who live in the suburbs will search for new places to live closer to where they work. E) B, C, and D may all take place in this situation.