A radioisotope has a decay constant of 0.0231 per day. What is its half-life (T½ = 0.693/λ)?
Correct answer D. 30 days
Explanation
Half-life and decay constant are inversely related by T½ = 0.693/λ, so T½ = 0.693/0.0231 per day = 30 days for this isotope.
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