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What is atomic clock?

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Have you wondered how time works?  What do you mean by 1 sec?  How the duration of 1 sec is decided?
All these questions will be answered when you understand the atomic clock. World time is based upon a reference and that reference is the atomic clock. 

What is atomic clock An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. i.e. locking an electronic oscillator to the frequency of an atomic transition. The transition is generally between hyperfine level which is a small shifts and splittings in the energy levels of atoms resulted from interaction between the magnetic moments associated with electron spin and the electrons' orbital angular momentum.

Elements used for atomic clock1. Cesium-133 2. Rubidium-87
Cesium atomic clockIt employ a beam of cesium atoms. The clock separates cesium atoms of different energy level…