Q.

At the height h above the surface of earth, the value of g: (R is radius of the earth)

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a

Falls by 1%  of the value at the surface if h=9R

b

Falls by 1%  of the value at the surface if h=7R

c

Falls by 1%  of the value at surface if h=32km

d

Falls by 1%  of the value of surface if h=64km

answer is D.

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Detailed Solution

If  h<<R,   gh=g[12hR]=g2ghR

2ghR=ggh2hR×100=gghg×100=1

2h6400×100=1

h=32km

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