How can a half-life be used to tell the age of a sample?
A. The ratio between the radioactive form and stable form varies regularly with time.
B. The amount of radioactive form depends on the amount of radiation in the surroundings.
C. The half-life of an isotope is constant.
D. The ratio between the radioactive form and the stable form depends on the archaeological record.
E. both C and D
Answer: A
You might also like to view...
Which agency is in charge of the National Map program in the United States?
A. Bureau of Land Management B. Natural Resources Conservation Service C. U.S. Census Bureau D. U.S. Geological Survey
Where are deltas common?
A) Low energy shores B) High energy shores C) Leading edges of continents D) None of these choices
A nowcast is a weather forecast that extends for ____
A) 1-2 days B) usually not more than 6 hours C) 3 days or more D) 3 to 8 days
Most of the precipitation for the region east of the Rocky Mountains comes from:
A) modified mP air masses. B) evaporation from soils and vegetation. C) mT air masses. D) mA air masses.