One second is defined as

Question

One second is defined as (A) 1650763.73 periods of krypton clock (B) 652189.6 periods of krypton clock (C) 1650763.73 periods of cesium clock (D) 9192631770 periods of cesium clock

Tardigrade Admin · Accepted Answer

The second is the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom.

Q. One second is defined as

$1650763.73$ periods of krypton clock

$652189.6$ periods of krypton clock

$1650763.73$ periods of cesium clock

$9192631770$ periods of cesium clock

The second is the duration of $9192631770$ periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium- $133$ atom.