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ZX-3B6DAB95F12026年9月国际B卷 · 第 18 题
2026年9月国际B卷 · 原库模块 1 · Q18 参考答案
For a certain isotope, at the end of every 29-year period, the mass of a sample of the isotope has decayed to half its mass at the beginning of the 29-year period. The function \( s(t)=192(0.5)^{\frac{t}{29}} \) gives the approximate mass of this isotope, in grams, that remains t years after a 192-gram sample starts to decay. Which statement is the best interpretation of \( s(2·29)=48 \) in this context?
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