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ehidna [41]
2 years ago
9

You have 400 mg of a radioisotope with a half-life of 5 minutes. How much will be left after 30 minutes?

Advanced Placement (AP)
1 answer:
shepuryov [24]2 years ago
3 0
If the half-life is 5 minutes, then 30 minutes is equivalent to 6 half-lives. So, after six successive half-lives, the 400 mg of the radioisotope would have a mass of 400(0.5)⁶ = 6.25 mg.

Thus, A would be the correct answer choice here.
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