In SI system, the unit of time is:
Correct answer: A. Second
- A. Second
- B. Minute
- C. Hour
- D. Day
Explanation
The second (s) is the base unit of time in the SI system. It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom. The second is the fundamental unit for measuring time intervals and is used in various scientific, technological, and everyday contexts.
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About Measurements
Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
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