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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
    Half-life of a radioactive substance which disintegrates by 75 % in 60 minutes, will be         [MP PMT 2002]

    A)                 120 min               

    B)                 30 min

    C)                 45 min  

    D)                 20 min

    Correct Answer: B

    Solution :

              75% of the substance disintegrates in two half lives 2 half lives = 60 min. \\[{{t}_{1/2}}=30\min \].


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