Time period T of a satellite in orbit of radius r around Earth is (Kepler's 3rd law):
AT ∝ √r
BT ∝ r²
CT² ∝ r³
DT² ∝ r
Answer & Solution
Correct answer: C. T² ∝ r³
By Kepler's third law: T² ∝ r³ (or specifically T² = (4π²/GM) r³). This applies to any satellite or planet in orbit.
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