Is it true if there is no atmosphere, the duration of days would decrease by $4 minutes$ ?

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True

False

answer is A.

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Detailed Solution

The above statement is True.
Without an atmosphere, there would be no refraction and the length of the day would shorten. The Sun is still visible after it is mathematically below the horizon and before it rises because the Sun's light is refracted as it travels through the Earth's atmosphere. Therefore, if there were no atmosphere, there would be no refraction, which would result in a shorter day.

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