If the fraction of the atoms of a radioactive material left after 120years is 1/64,

PHYSICSJAMB 2000

If the fraction of the atoms of a radioactive material left after 120years is 1/64, what is the half-life of the material?

  • A. 24 years
  • B. 20 years
  • C. 10 years
  • D. 2 years

Correct Answer: B. 20 years

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