Question

the average distance of uranus from the sun is about 20 AU and that of pluto is about 40 AU .find the ratio of the time periods of revolution of these planets around the sun.

Answer 1

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Logic Used :
1) Kepler's Law of Time Period :
That is,
$\boxed{T^2 = R^3 }$
where
T - Time Period
R - Radius of Orbit (If spherical)

After solving we will get,
Desired Ratio :
$\frac{1}{2 \sqrt2}$