Find the rate constant of a first-order reaction in $sec^{-1}$ having a half-life of $2.5 \ hours$.
- A$6.9 \times 10^{-5} \ sec^{-1}$
- B$8.4 \times 10^{-5} \ sec^{-1}$
- C$4.3 \times 10^{-5} \ sec^{-1}$
- D$7.7 \times 10^{-5} \ sec^{-1}$
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