Universal time is based on [SCRA 1989] – McqOptions

MCQOPTIONS

1.	Universal time is based on [SCRA 1989]
A.	Rotation of the earth on its axis
B.	Earth's orbital motion around the earth
C.	Vibrations of cesium atom
D.	Oscillations of quartz crystal
Answer» D. Oscillations of quartz crystal

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