The depth d at which the value of acceleration due to gravity becomes 1n  times the value at the surface, is [R = radius of the earth]

         (a) Rn                              (b)  Rn-1n                          

         (c) Rn2                             (d) Rnn+1

(b)         g1=g 1-dRgn=g1-dRd=n-1n R

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