The distance of two planets from the sun are 1013 and 1012

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The distance of two planets from the sun are 10¹³ and 10¹² metres respectively. The ratio of time periods of these two planets is

1. 1
  √10
2. 100
3. 10 √10
4. √10

Correct Option: C

T² ∝ R³ (Kepler's law)

	T₁²	=			10¹³		³	⇒	T₁	= 10 √10
	T₂²				10¹²				T₂