Question

Assertion :The smaller the orbit of a planet around the Sun, the shorter is the time it takes to complete. Reason: According to Kepler's law of planetary motion, the square of time period is proportional to cube of mean distance from Sun

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

According to Kepler's Law, $T^2\propto R^3$

$⟹T\propto (R{)}^{3/2}$

So, as R decreases, T decreases.