Q .     The height at which the acceleration due to gravity becomes `g/9` (where `g` = the acceleration due to gravity on the surface of the earth) in terms of `R`, the radius of the earth is

JEE 2009
A

`2R`

B

`R/sqrt2`

C

` R/2`

D

`Rsqrt2`

HINT

`g' = (GM)/(R+h)^2`
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