Daughter materials after two half-lives with 80g sample is 20g.
What is half-life?
Half-life is the time taken to decay half of its material.
The sample is having 80g.
According to question, there are two half-lives.
After first half-life, the daughter will have 40g ([tex]\frac{80}{2}[/tex]).
After second half-life, the daughter will have 20g ([tex]\frac{40}{2}[/tex]).
Therefore, the daughter materials are 20g after two half-lives.
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