According to Kepler, the period of revolution of a planet (T) and its mean distance from the sun (r) are related by the equation
(a) T3 r3 = constant (b) T2 r–3 = constant
(c) Tr3 = constant (d) T2r = constant
Answer:b
(5)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)