Assertion (A): The same face of the Moon is always presented to the Earth. Reason (R): The Moon rotates about its own axis in 23 days which is about the same time that takes to orbit the Earth.
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UPSC Civil Services preparation
- ABoth (A) and (R) are individually true and R is the correct explanation of A
- BBoth (A) and (R) are individually true and R is not the correct explanation of A
- CA is true but R is falseCorrect
- DA is false but R is true
Explanation
The correct option is C because while the Assertion is true, the Reason contains incorrect data.
Assertion A is true because we always see the same side of the Moon. This phenomenon is known as synchronous rotation or tidal locking.
Reason R is false because the Moon takes approximately 27.3 days to complete both one rotation on its axis and one revolution around the Earth. The value of 23 days mentioned in the statement is incorrect. Because these two periods are equal, the same hemisphere of the Moon always faces our planet.
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