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JEE Main & Advanced Physics Nuclear Physics And Radioactivity JEE PYQ-Nuclear Physics

  • question_answer
    Starting with a sample of pure\[^{66}Cu,\] 7/8 of it decays into Zn in 15 min. The corresponding half-life is                                [AIEEE 2005]

    A) 10 min

    B) 15 min

    C) 5 min

    D) \[7\frac{1}{2}\] min

    Correct Answer: C

    Solution :

    [c] The number of particles left undisintegrated,
    where,decay constant
    initial number of atoms
    andpresent number of atoms
            
          
    Taking log both sides, we get
    Half life period


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