The ratio of the weights of a body on the Earth’* surface to that on the surface of a planets is 9 : 4. The mass of the planet is 1/9 th of that of the Earth. If 'R' is the radius of the Earth, what is the radius of the planet ? (Take the planets to have the same mass density)
(1) R/9
(2) R/2
(3) R/3
(4) R/4
