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  1. The distance of Neptune and Saturn from the sun is nearly 1013 and 1012 meter respectively. Assuming that they move in circular orbits, their periodic times will be in the ratio
    1. 10
    2. 100
    3. 10 √10
    4. 1000
Correct Option: C

T2 ∝ r3 (According to Kepler’s law)
T12 ∝ (1013)3 and T22 ∝ (1012)3

∴
T12
 = (10)3 or
T1
 = 10 √10
T22T2


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