The Time It Takes for Half of a Radioisotope's Atoms

question 9

Multiple Choice

The time it takes for half of a radioisotope's atoms to decay ____.
 

• A) cannot be calculated
• B) is used to construct the geologic time scale
• C) is its half-life
• D) is the same for uranium 238 and carbon 14
• E) is highly variable

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A racial or ethnic group in the United States with ancestry from the indigenous peoples of Sub-Saharan Africa.