The radius of earth is \( R \). Height of a point vertically above the earth's surface at which ...

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The radius of earth is \( R \). Height of a point vertically above the earth's surface at which acceleration due to gravity becomes \( 1 \% \) of its value at the surface is
(a) \( 8 R \)
(b) \( 9 R \)
(c) \( 10 R \)
(d) \( 20 R \)
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