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JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank Self Evaluation Test - Nuclei

  • 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 it had decayed and time \[{{t}_{1}}\] when \[\frac{1}{3}\] of it had decayed is:

    A)  14 min

    B)  20 min

    C)  28 min

    D)  7 min

    Correct Answer: B

    Solution :

    [b] Not available


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