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T2∝a3, meaning the period squared is proportional to the semi-major axis cubed, making option 2 correct. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Period squared is proportional to distance cubed. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
Kepler’s third law: the square of the orbital period (T2) is proportional to the cube of the semi-major axis (a3), i.e., T2∝a3. This relates time and distance for planetary motion.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
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