試題詳解

38. Radioactive elements decay via first-order kinetics. Consider a certain type of nucleus that has a rate constant of 1.6 × 10-2 h¯¹. A sample contains 7.9 × 10⁸ radioactive nuclides. Calculate the time required for 63% of the nuclides to decompose.
(A) 2.9 x 10¹ h
(B) 2.7 x 10¹ h
(C) 1.3 x 10¹ h
(D) 6.2 x 10¹ h
(E) 1.3 x 10¯¹ h