On a semi-log graph where the y-axis is log10A (activity in Bq) and the x-axis is time t (in hours), a straight line passes through the points (t1=2h,log10A1=3.2) and (t2=8h,log10A2=2.0).
(a) (i) Determine λ.
(b) (ii) Find t1/2."}],
(c) Two radioactive nuclides P and Q are represented by straight lines on the same semi-logarithmic plot of lnN against time. The line for P is steeper than that for Q. Which nuclide has the longer half-life? Justify your answer in one sentence. ", "options": [], "parts": [], "kuas_level": "Understanding", "difficulty": "Intermediate"}]}