1. Radioactive elements decay via first-order kinetics. Consider a certain type of nucleus that has a rate constant of 2.6✕10–2 h–1. A sample contains 6.5✕108 radioactive nuclides. Calculate the time required for 61% of the nuclides to decompose.
(A) 1.9 ✕101 h;
(B) 1.6✕101 h;
(C) 0.8✕101 h;
(D) 3.6✕101 h;
(E) 2.4✕101 h

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統計: A(0), B(0), C(0), D(4), E(1) #2345304