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Per NCERT §7.2 (3rd law), Kepler's law of periods states which relation between period T and semi-major axis a?
AT ∝ a²
BT² ∝ a³
CT ∝ a
DT³ ∝ a²
Answer & Solution
Correct answer: B. T² ∝ a³
NCERT §7.2(3): T² ∝ a³. The proportionality constant equals 4π²/(GM_sun).
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