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If 80% of a radioactive element undergoing decay is left over after a certain period of time  from the start, how many such periods should elapse from the start for just over 50% of the element to be left over?



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If 80% of a radioactive element undergoing decay is left over after a certain period of time  from the start, how many such periods should elapse from the start for just over 50% of the element to be left over?

1 Answer
127 votes
Answer Key / Explanation : (3) -

(3)

Let  (Amount left)

 Amount left [ number of half lives]

Alternatively

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