The half-life of a substance is the time it takes for half of it to decay.

1. After one half-life, half of the original amount would remain. So, if we start with 20 grams, after one half-life, we would have 20/2 = 10 grams remaining.

2. After two half-lives, half of the remaining amount would decay. So, we would have 10/2 = 5 grams remaining.

3. After three half-lives, half of the remaining amount would decay. So, we would have 5/2 = 2.5 grams remaining.

So, the answer is e) 2.5 grams.

Question

The half-life of a substance is the time it takes for half of it to decay.

1. After one half-life, half of the original amount would remain. So, if we start with 20 grams, after one half-life, we would have 20/2 = 10 grams remaining.

2. After two half-lives, half of the remaining amount would decay. So, we would have 10/2 = 5 grams remaining.

3. After three half-lives, half of the remaining amount would decay. So, we would have 5/2 = 2.5 grams remaining.

So, the answer is e) 2.5 grams.

Knowee AI · Accepted Answer

The half-life of a substance is the time it takes for half of it to decay.

1. After one half-life, half of the original amount would remain. So, if we start with 20 grams, after one half-life, we would have 20/2 = 10 grams remaining.

2. After two half-lives, half of the remaining amount would decay. So, we would have 10/2 = 5 grams remaining.

3. After three half-lives, half of the remaining amount would decay. So, we would have 5/2 = 2.5 grams remaining.

So, the answer is e) 2.5 grams.

Suppose that there was 20 grams of radioactive Carbon in a fossil. After 3 half-lives, approximately how much would still be radioactive? a40 g b20 g c10 g d5 g e2.5 g

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