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प्रश्न
The SI unit of time, the second (s), is defined based on the transition frequency of which atom?
विकल्प
Caesium-133
Carbon-12
Platinum-Iridium
Hydrogen-1
MCQ
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उत्तर
Caesium-133
Explanation:
The second is defined as the duration of a specific number of periods of radiation corresponding to a transition in the Caesium-133 atom.
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