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J & K CET Engineering J and K - CET Engineering Solved Paper-2007

  • question_answer
    The half-life of \[\text{R}{{\text{a}}^{\text{226}}}\]is \[1620\text{ }yr,\] the decay constant (k) is

    A)  0.000452    

    B)  0.0004278

    C)  0.04278      

    D)  0.004278

    Correct Answer: B

    Solution :

     Decay constant \[(k)=\frac{0.693}{{{t}_{1/2}}}\] \[{{t}_{1/2}}=\frac{0.693}{k}\] \[=\frac{0.693}{1620}\] \[=0.0004278\]


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