Answered

How many half-lives have passed in a sample that originally contained 5000 parent isotopes but now has only 625?

Answer :

Answer:

3 half lives

Explanation:

5000 * (1/2)^n  = 625           where n = number of half lives

log ( 625/5000) / log(1/2) = n  = 3

5000         2500     1250      625  

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