UPSC CDS I 2024 GK Paper

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Question : 53 of 120

Marks: +1, -0

Which one of the following correctly describes the principle of the working of an atomic clock?

Vibration of a small quartz crystal
Simple harmonic motion of atoms inside a crystal
Resonant frequency in cesium (or rubidium) atom
Excitation and de-excitation of hydrogen atoms

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