Question

After two half-lives, how much of the original material has decayed?

Answer 1

Answer:

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After 1 half life , clearly HALF of the original isotope remains. And after TWO half-lives, a HALF + HALF of a HALF , i.e. 34 of the original mass has decayed

Explanation:

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Answer 2

Answer:

After 1 half life , clearly HALF of the original isotope remains. And after TWO half-lives, a HALF + HALF of a HALF , i.e. 3 upon 4 of the original mass has decayed.