Q13

Two satellites orbit a planet. One of the satellites has an orbital radius of $2.3\times10^{6}\ \mathrm{m}$ and a period of $7.6\times10^{4}\ \mathrm{s}$. The other satellite has an orbital period of $1.3\times10^{5}\ \mathrm{s}$. What is the orbital radius of this second satellite?
A. $1.3\times10^{6}\ \mathrm{m}$
B. $3.3\times10^{6}\ \mathrm{m}$
C. $3.9\times10^{6}\ \mathrm{m}$
D. $5.1\times10^{6}\ \mathrm{m}$