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1)

The value of gravititational acceleration g at a height h above the earth's surface is g4 , then (R=radius of earth)


A) h=R

B) h=R2

C) h=R3

D) h=R4

Answer:

Option A

Explanation:

 The value of acceleration due to gravity g at a height h is given by

 g=g(ReRe+h)2

[ Symbols have their usual meanings]

when,

 g'= g4   and Re= R

 So, g4=g(RR+h)2

 12=RR+h

      2R= R+h

       R= h