An earth satellite of mass m revolves in a circular orbit at a height h from the surface of the earth. R is the radius of the earth and g is acceleration due to gravity at the surface of the earth. The velocity of the orbit is given by

Q: An earth satellite of mass m revolves in a circular orbit at a height h from the surface of the earth. R is the radius of the earth and g is acceleration due to gravity at the surface of the earth. The velocity of the orbit is given by

(a) $\frac{g R^2}{R + h}$

(b) $g R $

(c) $\frac{g R}{R + h}$

(d) $\sqrt{\frac{g R^2}{R + h}}$

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Ans: (d)