Answer
The period depends on $~~r^{3/2}$
Work Step by Step
We can write a general expression for the period:
$T^2 = \frac{4\pi^2}{GM}~r^3$
$T = \sqrt{\frac{4\pi^2}{GM}}~r^{3/2}$
The period depends on $~~r^{3/2}$
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