Question

Name the SI unit of time and define it

Answer 1

The SI unit of time is second

*which has been further accurately defined as “the time interval equal to 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.

*There is a primary standard for the unit of time THE CESIUM ATOMIC FREQUENCY STANDARD also called as atomic clock for this purpose in U.S.A.

EX-:

IS=1/86400×one mean solarday

Answer 2

Answer:

The SI unit of time is second (s).

A second is defined as 1/86400th part of a mean solar day. i.e.,

1 s = 1/86400 × one mean solar day

Hope its helpful to you!

pls mark me brainliest!