Question

After two half lifes how much of the original minrial has decayed

Answer 1

Answer:

Well,

3

4

of the original isotope has decayed........

Explanation:

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

4

of the original mass has decayed.

Answer 2

Answer:

75 percent

Explanation: