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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Causes of radioactivity and Group displacement law

  • question_answer
    A certain nuclide has a half-life period of 30 minutes. If a sample containing 600 atoms is allowed to decay for 90 minutes, how many atoms will remain      [NCERT 1978]

    A)                 200 atoms          

    B)                 450 atoms

    C)                 75 atoms             

    D)                 500 atoms

    Correct Answer: C

    Solution :

              \[n=\frac{90}{30}=3\]\[\Rightarrow N=\frac{600}{{{2}^{3}}}=75\,\text{atoms}\].


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