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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