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प्रश्न
How many vibrations of cesium-133 radiation occur in exactly one second?
पर्याय
1,000,000,000
5,000,000,000
9,192,631,770
10,000,000,000
MCQ
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उत्तर
9,192,631,770
Explanation:
One second is officially defined as the time it takes for 9,192,631,770 vibrations of the radiation from a caesium-133 atom.
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