Question

What is the SI unit of time?​

Answer 1

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The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency Cs. , the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s–1.

Answer 2

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sᴇᴄᴏɴᴅ

The SI unit of time is second (s) and for distance is metre (m). So the SI unit of speed is metre per second (m/s). Speed is also measured in kilometre per hour (km/h). The average speed of a moving object is defined as the total distance covered by it divided by the total time taken.

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✵ ᴡʜʏ ᴛʜᴇ sɪ ᴜɴɪᴛ ᴏғ ᴛɪᴍᴇ ɪs sᴇᴄᴏɴᴅ?

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Second, fundamental unit of time, now defined in terms of the radiation frequency at which atoms of the element cesium change from one state to another. The second was formerly defined as 1/86,400 of the mean solar day—i.e., the average period of rotation of the Earth on its axis relative to the Sun.