Taking Earth’s radius as

PHYSICS · Single correct · CBSE · Physics · Gravitation · Gravitation

Problem

6400\,\text{km}

, at approximately what depth below the surface will the acceleration due to gravity become

90\%

of its surface value? (a)

320\,\text{km}

(b)

1280\,\text{km}

(c)

640\,\text{km}

(d)

576\,\text{km}