The value of gravitational acceleration at a height equal to radius of earth, is

Options

A. `50%` of value at earth's surface
B. `25%` of vallue at earth's surface
C. `75%` of value at earth's surface
D. same as value at earth's surface

Answer

b

Explanation

`(g_(2))/(g_(1))=((R)/(R+h))^(2)`
`=((R)/(R+R))^(2)=(1)/(4)`
`(g_(2))/(g_(1))=0.25=25%`
`g_(2)=25%g_(1).`