NEET Sample Paper NEET Sample Test Paper-51

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

    A) 7 min               

    B) 14 min

    C) 20 min             

    D) 28 min

    Correct Answer: C

    Solution :

    Time equal to half life spends in decaying substance to half of present value.

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