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

  • question_answer
    If the half-life period of a first order reaction is 138.6 minutes, then the value of decay constant for the reaction will be [MH CET 1999]

    A)                 5 minute?1          

    B)                 0.5 minute?1

    C)                 0.05 minute?1    

    D)                 0.005 minute?1

    Correct Answer: D

    Solution :

              \[k=\frac{0.693}{{{t}_{1/2}}}=\frac{0.693}{138.6\,min}=0.005mi{{n}^{-1}}\]


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