If $R$ is the radius of the Earth and $g$ is the acceleration due to gravity on the Earth's surface,then the mean density of the Earth is ..........

  • A
    $\frac{4 \pi G}{3 g R}$
  • B
    $\frac{3 \pi R}{4 g G}$
  • C
    $\frac{3 g}{4 \pi R G}$
  • D
    $\frac{\pi R g}{12 G}$

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