A geostationary satellite orbits Earth at radius r_g. Another satellite orbits at radius r_g/4. Its period is approximately:
A6 hours
B3 hours
C12 hours
D24 hours
Answer & Solution
Correct answer: B. 3 hours
T² ∝ r³. T_new/T_g = (1/4)^(3/2) = 1/8. So T_new = 24/8 = 3 hours.
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