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JEE Main & Advanced AIEEE Solved Paper-2011

  • question_answer
    The half life of a radioactive substance is 20 minutes. The approximate time interval \[({{t}_{2}}-{{t}_{1}})\] between the time \[{{t}_{2}}\] when \[\frac{2}{3}\] of its has decayed and time \[{{t}_{1}}\] when \[\frac{1}{3}\] of its had decayed is   AIEEE  Solved  Paper-2011

    A) 28 min                     

    B)  7 min

    C) 14 min                     

    D)  20 min

    Correct Answer: D

    Solution :

                 At \[t={{t}_{2}},{{N}_{2}}=\frac{N}{3}\] (Left)    \[t={{t}_{1}},{{N}_{1}}=\frac{2N}{3}\] \[\Rightarrow \,{{t}_{2}}-{{t}_{1}}=\] half life \[=20\] min


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