Earth’s radius is approximately

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

Problem

6.4\times10^{3}\,\text{km}

. Up to what depth

d

below the surface will the acceleration due to gravity fall to

75\%

of its surface value? (a)

3.2\times10^{3}\,\text{km}

(b)

1.6\times10^{3}\,\text{km}

(c)

0.8\times10^{3}\,\text{km}

(d)

4.8\times10^{3}\,\text{km}