The half lives of a radioactive substance are $T$ and $2T$. years for $\alpha  - $ emission and $\beta - $ emission respectively. The total de cay constnnt for simultaneous decay of $\alpha$ and $\beta$ adioactive substance is ___

  • A

    $\frac{3}{2}\frac{{\ln 2}}{T}$

  • B

    $\frac{{3\ln 2}}{T}$

  • C

    $\frac{{\ln 2}}{3T}$

  • D

    $\frac{2}{3}\frac{{\ln 2}}{T}$

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