Assertion (A): To orbit around the Sun the planet Mars takes lesser time than the time taken by the earth. Reason (R): The diameter of the planet Mars is less than that of earth.
✓ Correct answer: d) A is false, but R is true.
ExplanationAssertion (A) is False: Mars takes a longer time than Earth to orbit the Sun.The time taken by a planet to or- bit around the Sun is called its orbital period or year.Mars has an orbital period of about 687 Earth days which means it takes 687 days to complete one revolution around the Sun.Earth takes 365.25 days (about 365 days) to complete one revolu- tion around the Sun.Reason (R) is True: Mars does have a smaller diameter than Earth.The diameter of Earth is 12,742 km .The diameter of Mars is 6,779 km (almost half of Earth).The time taken by a planet to orbit the Sun depends on its distance from the Sun, not its diameter.Since Mars is farther from the Sun than Earth thus it has a longer orbital period.11
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