18. A specific type of nucleus has a half-life of 40 min. How long is required for 80% of the nuclid
問題詳情
18. A specific type of nucleus has a half-life of 40 min. How long is required for 80% of the nuclidesto decompose? (ln2 = 0.693； ln0.2 = -1.609) (A) 80 min (B) 85 min (C) 95 min (D) 102 min (E) 120 min