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
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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:
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