Physics
JAMB 2025
Calculate the decay constant of a radioactive isotope of half-life 138.5 s.
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A.
5.0 × 10\(^{-3}\) s\(^{-1}\)
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B.
5.1 × 10\(^{-3}\) s\(^{-1}\)
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C.
4.9 × 10\(^{-3}\) s\(^{-1}\)
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D.
5.2 × 10\(^{-3}\) s\(^{-1}\)
Correct Answer: Option A
Explanation
Answer: A
λ = \(\frac{ln2}{T½ }\) ⇒ \(\frac{0.693}{138.5}\) ≈ 5.0 × 10\(^{-3}\) s\(^{-1}\).
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