`Co^(60)` has half-life of `5.3` years. Find the number of half-lives for `7//8` of the orignal sample to disintergrate.

`Co^(60)` has half-life of `5.3` years. Find the number of half-lives for `7//8` of the orignal sample to disintergrate.
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`Co^(60)` has half-life of `5.3` years. Find the number of half-lives for `7//8` of the orignal sample to ... yrs B. 9.2 yrs C. 10.6 yrs D. 15.9 yrs
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