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Answer :
Final answer:
The period of a second hand clock is 60 seconds, derived from the definition of a second based on the vibrations of a cesium atomic clock.
Explanation:
The period of a clock’s second hand, which refers to the time it takes to complete one full cycle or rotation, is C. 60 seconds. This is derived based on the SI unit for time, the second, historically defined as 1/86,400 of a mean solar day. Today, the second is more accurately defined based on a constant physical phenomenon - the steady vibrations of Cesium atoms that form the basis of the cesium atomic clock. In this atomic clock, one second is defined as the time required for 9,192,631,770 Cesium atom vibrations.
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