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In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is...

Physics
WAEC 1994
In 24 days a radioactive isotope decreases in mass from 64g to 2g. What is the half life of the radioactive material
  • A. 0.75 days
  • B. 2.58 days
  • C. 4 days
  • D. 4.80 days
  • E. 6 days
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Correct Answer: Option D
Explanation
64g → 32g → 16g → 8g → 4g → 2g

Half life time= 24/5 = 4.8 days
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