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The depth from the surface of the earth ...

The depth from the surface of the earth where acceleration due to gravity is `20%` of its value on the surface of the earth is (R = 6400 km)

A

1280 km

B

5120 km

C

128 km

D

640 km

Text Solution

Verified by Experts

The correct Answer is:
b
`g_(d)=g(1-(d)/(R)) therefore 0.2=1-(d)/(6400)`
`therefore d= 0.8xx6400" "therefore d=5120km.`
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