Since 1967 the standard definition for the second has been based on which of the following?

Since 1967 the standard definition for the second has been based on which of the following?

A. characteristic frequency of the cesium-133 atom


B. average solar day


C. sidereal day


D. Greenwich Civil Time


E. None of the above


The answer is :

A. characteristic frequency of the cesium-133 atom


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