The height in terms of radius of the earth (R), at which the acceleration due to gravity becomes g/9, where g is acceleration due to gravity on…

The height in terms of radius of the earth $\displaystyle (R)$, at which the acceleration due to gravity becomes $\displaystyle \frac{g}{9}$, where $\displaystyle g$ is acceleration due to gravity on earth's surface, is $\displaystyle \_\_\_\_$.