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      Question

      A sample contains equal numbers of two isotopes X and Y,

      each with half-lives of 10 days and 20 days respectively. What is the ratio of activities Aâ‚“ : Aáµ§ after 20 days?
      A 1:8 Correct Answer Incorrect Answer
      B 1:4 Correct Answer Incorrect Answer
      C 1:1 Correct Answer Incorrect Answer
      D 1:2 Correct Answer Incorrect Answer

      Solution

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