Suppose 1000g of a radioactive substance are present initially and 3 years later only 5oog remain

Question

Suppose 1000g of a radioactive substance are present initially and 3 years later only 5oog remain. Half-life is the amount of time it takes for a quantity that decays exponentially to become half its initial amount. A(t)=A0λ^rt
How much of the substance will be present after 3 years?


How much of the substance will be present after 6 years?

Answer 1

1000 g

500 g     after 3 years

250 g     after 6years