Kepler’s third law states that square of period of revolution (T) of a planet around the sun, is proportional to third power of average distance 
between sun and planet i.e. 
here 
is constant. If the masses of sun and planet are 
and 
respectively then as per Newton’s law of gravitation force of attraction between them is 
, here 
is gravitational constant. The relation between 
and 
is described as
Text Solution
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: Gravitational force of attraction between sun and planet provides centripetal
force for the orbit of planet.
Time period of the planet is given by
(Using (i))
According to question,
Comparing equations (ii) and (iii), we get
( 
)
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