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Question: Answered & Verified by Expert
Average distance of the Earth from the Sun is $L_{1}$ : If one year of the Earth $=D$ days, one year of another planet whose average distance from the Sun is $L_{2}$ will be
PhysicsGravitationJEE Main
Options:
  • A $D\left(\frac{L_{2}}{L_{1}}\right)^{\frac{1}{2}}$ days
  • B $D\left(\frac{L_{2}}{L_{1}}\right)^{\frac{3}{2}}$ days
  • C $D\left(\frac{L_{2}}{L_{1}}\right)^{\frac{2}{3}}$ days
  • D $D\left(\frac{L_{2}}{L_{1}}\right)$ days
Solution:
2747 Upvotes Verified Answer
The correct answer is: $D\left(\frac{L_{2}}{L_{1}}\right)^{\frac{3}{2}}$ days
By Keplar's law,
$$
\begin{array}{l}
T^{2} \propto R^{3} \\
T=D\left(\frac{L_{2}}{L_{1}}\right)^{3 / 2}
\end{array}
$$

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