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

If the fraction of the atoms of a radioactive material left after 120years is 1/64 , what is the half-life of the material? 1/64
A. 20 years
B. 10 years
C. 2 years
D. 24 years

Correct Option: Answer is A

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