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FE Civil Engineering Exam Prep

Category - Civil Engineering

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The half-life of 14 grams of a substance is 3 hours. How many grams of the substance remain after 6 hours?

3.5 grams
7.0 grams
14 grams
28 grams
7.5 grams

Explanation

Answer: 3.5 grams

The half-life of a substance is the amount of time required for that substance to decay to half of its original mass. In the context of this question, 6 hours represents two half-lives. Therefore, the substance will decay to one-fourth of its original mass, or 3.5 grams.

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