The SI standard of time is based on: A)the daily rotation of the Earth B)the frequency of light emitted by Kr⁸⁶ C)the yearly revolution of the Earth about the sun D)a precision pendulum clock E)none of these

Question

Quizplus · Accepted Answer

The SI standard of time is based on the frequency of the radiation emitted by the transition between two levels of the ground state of the cesium-133 atom, not any of the options listed.

The SI Standard of Time Is Based On