A) \[\frac{{{R}_{E}}}{3}\]
B) \[2\frac{{{R}_{E}}}{3}\]
C) \[\frac{{{R}_{E}}}{2}\]
D) \[\frac{{{R}_{E}}}{4}\]
Correct Answer: B
Solution :
Acceleration due to gravity at a depth d is\[g=g\left[ 1-\frac{d}{{{R}_{E}}} \right]\]\[\Rightarrow \] \[\frac{g}{3}=g\left[ 1-\frac{d}{{{R}_{E}}} \right]\]Or \[d=\frac{2}{3}{{R}_{E}}\]
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