The approximate height from the surface of earth at which the weight of the body becomes \( 1 / ...

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The approximate height from the surface of earth at which the weight of the body becomes \( 1 / 3 \) of its weight on the surface of earth is [Radius of earth \( \mathrm{R}=6400 \mathrm{~km} \) and \( \sqrt{3}=1.732 \) ]
(a) \( 3840 \mathrm{~km} \)
(b) \( 4685 \mathrm{~km} \)
- (c) \( 2133 \mathrm{~km} \)
- (d) \( 4267 \mathrm{~km} \)
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