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Tatu Tatu
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6 years ago
This illustration shows that after two half-lives,
  __________ percent of the parent radioisotope has
  decayed.
  a. 100
  b. 75
  c. 50
  d. 25
  e. 0

Question 2

The time it takes for half of a radioisotopes 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 all of these.
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kamehameha2014kamehameha2014
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6 years ago
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