If $T$ is the half life of a radioactive material, then the fraction that would remain after a time $\frac{T}{2}$ is

  • A

    $\frac{1}{2}$

  • B

    $\frac{3}{4}$

  • C

    $\frac{1}{{\sqrt 2 }}$

  • D

    $\frac{{\sqrt 2 - 1}}{{\sqrt 2 }}$

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