The SI standard of time is based on:- A.A precision pendulum clock B.The daily rotation of the earth C.the yea

Question

The SI standard of time is based on:-
A.A precision pendulum clock   B.The daily rotation of the earth
C.the yearly revolution of the Earth about the sun  D.9 192 631 770 times the period of vibration of radiation from the cesium-133 atoms

GPT-5 mini · Answer

Answer: D. 9 192 631 770 times the period of vibration of radiation from the cesium-133 atom.

Explanation: The SI second is defined as exactly 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom. Earlier definitions used Earth's rotation/day or year, but the current SI standard uses the cesium atomic transition.

The SI standard of time is based on:-
A.A precision pendulum clock B.The daily rotation of the earth
C.the yearly revolution of the Earth about the sun D.9 192 631 770 times the period of vibration of radiation from the cesium-133 atoms

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The SI standard of time is based on:- A.A precision pendulum clock B.The daily rotation of the earth C.the yearly revolution of the Earth about the sun D.9 192 631 770 times the period of vibration of radiation from the cesium-133 atoms

All Answers 1

Submit Your Answer

The SI standard of time is based on:-
A.A precision pendulum clock B.The daily rotation of the earth
C.the yearly revolution of the Earth about the sun D.9 192 631 770 times the period of vibration of radiation from the cesium-133 atoms