25. Answer ALL parts of this question. The radioisotope americium-241 (241Am) has a half-life of 432.6 years and is ofte

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25 Answer All Parts Of This Question The Radioisotope Americium 241 241am Has A Half Life Of 432 6 Years And Is Ofte 1 (164.83 KiB) Viewed 44 times

25. Answer ALL parts of this question. The radioisotope americium-241 (241Am) has a half-life of 432.6 years and is often used in smoke detectors. The radioactive decay of americium-241 is a first-order reaction. (a) Define the term ‘half-life'. (1 mark) reaction i.e. In (A) = -kt, that the half- = (b) Show, through application of the integrated raw law for a first-order []t [A]o life, t), for a first-order reaction is given by In 2 t 1/2 k (3 marks) (c) Write an expression for the rate of radioactive decay of 241Am with respect to concentration. (1 mark) (d) A smoke detector initially has 0.3000 ug of 241 Am. After five years, how much +1 Am will be left? (3 marks) 241 (e) State whether you would expect the rate of radioactive decay of 241Am to depend on temperature or not, giving a brief explanation for your answer. (2 marks)