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Q.

The difference in the length of a mean solar day and a sidereal day is about:


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a

1 minute

b

4 minute

c

15 minute

d

56 minute 

answer is B.

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Detailed Solution

Concept- The duration of the solar day and the sidereal day should be computed given that there are 24 hours in a day on Earth. Based on how quickly the earth resumes its initial position after completing the revolution and rotation, the difference is determined.
Knowing the meanings of the terminology we'll use in the following discussion is recommended. The solar day and the sidereal day are defined as follows.
The length of time it takes the earth to complete one rotation around its axis—with the sun at its center—is known as a solar day. The sidereal day is the length of time it takes for the earth to complete one revolution around its axis with regard to a stationary, faraway star.
In the event of a sidereal day, the earth's location in relation to the faraway fixed star nearly stays the same. However, because of the earth's rotation around the sun, solar day requires a higher angle of rotation to return to the initial location. Given that the planet has 24 hours every day, a discrepancy of 4 minutes may be seen. The duration of a sidereal day and a solar day differs by a total of 4 minutes.
Hence, the correct option is 2
 
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