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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Rate of decay and Half-life

  • question_answer
    What is the half-life of a radioactive substance if 75% of a given amount of the substance disintegrates in 30 minutes

    A)                 7.5 minutes       

    B)                 25 minutes

    C)                 20 minutes         

    D)                 15 minutes

    Correct Answer: D

    Solution :

           75% of the substance disintegrates in two half lives.                                 2 half lives = 30 min \\[{{t}_{1/2}}=15\,\min \].


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