WAEC Chemistry 2011 Theory — Question 26
Question 26 of 31 from the West African Examinations Council (WAEC) Chemistry 2011 Theory paper, with the correct answer and a full explanation.
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8a(i) Explain the term half-life. (ii) Two radioactive elements P and Q have half-lives of 1200 seconds and 3600 seconds respectively. I. Which of the elements is more stable? II. Give a reason for your answer.
Model answer
(i) The half-life of a radioactive material is the time taken for the total amount present originally to decay to half. (ii) I. Q is more stable. II. Q is more stable because it has a longer half-life.
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