A half-life is the time it takes for half of a certain substance to decay. In this case, we're dealing with uranium.

Step 1: After the first half-life, half of the uranium will have decayed. So, 400g will become 200g.

Step 2: After the second half-life, half of the remaining uranium will have decayed. So, 200g will become 100g.

Step 3: After the third half-life, half of the remaining uranium will have decayed. So, 100g will become 50g.

So, after three half-lives, there will be 50g of uranium left.

Question

A half-life is the time it takes for half of a certain substance to decay. In this case, we're dealing with uranium.

Step 1: After the first half-life, half of the uranium will have decayed. So, 400g will become 200g.

Step 2: After the second half-life, half of the remaining uranium will have decayed. So, 200g will become 100g.

Step 3: After the third half-life, half of the remaining uranium will have decayed. So, 100g will become 50g.

So, after three half-lives, there will be 50g of uranium left.

Knowee AI · Accepted Answer

A half-life is the time it takes for half of a certain substance to decay. In this case, we're dealing with uranium.

Step 1: After the first half-life, half of the uranium will have decayed. So, 400g will become 200g.

Step 2: After the second half-life, half of the remaining uranium will have decayed. So, 200g will become 100g.

Step 3: After the third half-life, half of the remaining uranium will have decayed. So, 100g will become 50g.

So, after three half-lives, there will be 50g of uranium left.

17. The quantity of uranium is 400g, the amount of uranium left after three half-lives is: