What is the SI unit of time?

Correct option is B

The SI unit of time is the second. It is defined based on the vibration of cesium atoms in atomic clocks, where one second corresponds to exactly 9,192,631,770 cycles of radiation associated with the transition of cesium-133 atoms.

Key points:
● The second is the base unit of time in the International System of Units (SI).
● It is used globally for scientific measurements and daily life applications.
● The accuracy of atomic clocks ensures precise timekeeping for GPS, telecommunications, and scientific research.
● Other units of time, like minutes and hours, are derived from seconds.
● The concept of a second has evolved from astronomical observations to atomic definitions.
● Timekeeping is vital for navigation, communication, and scheduling.