1.

According to Kepler, the period of revolution of a planet (T) and its mean distance from the sun (r) are related by the equation [EAMCET (Med.) 1995; MH CET 2000; Pb. PET 2001]

A.             \[{{T}^{3}}{{r}^{3}}=\] constant          
B.             \[{{T}^{2}}{{r}^{-3}}=\]constant
C.               \[T{{r}^{3}}=\] constant    
D.             \[{{T}^{2}}r=\] constant
Answer» C.               \[T{{r}^{3}}=\] constant    


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