The activity R of an unknown radioactive nuclide is measured at hourly intervals. The results found are tabulated as follows:
t (h) |
0 |
1 |
2 |
3 |
4 |
R (MBq) |
100 |
35.36 |
12.51 |
4.42 |
1.56 |
(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.