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The activity R of an unknown radioactive nuclide is measured at hourly intervals. The results found are tabulated as follows:

t (h)01234
R (MBq)10035.3612.514.421.56

(i) Plot the graph of R versus t and calculate half-life from the graph.

(ii) Plot the graph of ln(R/R0) versus t and obtain the value of half-life from the graph.

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(i) t1/2 = 40 min (approx).

(ii) Slope of graph = –λ

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