Source A has a half-life of 10 million years, and source B has a half-life of 5 million years. After 10 million years, what percent of each source remains? (1 point)

Question

Responses

25% of source A and 0% of source B
25% of source A and 0% of source B
50% of source A and 0% of source B
50% of source A and 0% of source B
50% of source A and 25% of source B
50% of source A and 25% of source B
25% of source A and 25% of source B

Answer 1

- 25% of source A and 0% of source B

After 10 million years, source A would have undergone one half-life, leaving 50% of the original amount remaining. However, since source B has a half-life of 5 million years, it would have undergone two half-lives, resulting in 0% of the original amount remaining.