75% of a radioactive element decays in 6 hours. Its half life period is ______________ hours?
Correct answer: C. 3
- A. 3/4
- B. 1/6
- C. 3
- D. 4
Explanation
If 75% decays, 25% remains, which is one-fourth of the original amount or two half-lives. Therefore, 6 hours represents two half-lives, giving a half-life of 3 hours.
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