Answer / Gurvinder Singh

First, calculate the number of half-lives passed: 10 * 28.1 years = 281 years. The remaining fraction of Sr-90 is 1/2^(number of half-lives), so in this case it's 1/2^10 ≈ 0.000977 or approximately 0.0977%. To calculate the first order rate constant, use the formula k = ln(2)/half life. For Sr-90, k = ln(2) / 28.1 years ≈ 0.0249 years^-1.

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