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प्रश्न
What was the original scientific basis for defining one second?
पर्याय
Pendulum swings
Light travel time
1/86,400 of a solar day
Part of Earth’s orbit
MCQ
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उत्तर
1/86,400 of a solar day
Reason:
Originally, one second was defined as 1/86,400 of the average solar day, the time Earth takes to rotate once.
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