A sample of radioactive actinium-288 has an initial activity of 363 disintegrations per minute and its activity is measured in a laboratory every six hours. The table below shows the recorded data. Time (hours) Disintegrations per minute (min'¹) (t) 0 6 12 18 24 (A) 363 184 93.2 47.3 24.0 In A Calculate the tn # gradient of the In A graph and estimate the Value of the decay Constant (2) to two decimal place.
