The time period of a simple pendulum of length $L$ as measured in an elevator descending with acceleration $\frac{g}{3}$ is
  • A$2\pi \sqrt {\frac{{3L}}{g}} $
  • B$\pi \sqrt {\left( {\frac{{3L}}{g}} \right)} $
  • C$2\pi \sqrt {\left( {\frac{{3L}}{{2g}}} \right)} $
  • D$2\pi \sqrt {\frac{{2L}}{{3g}}} $
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