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cesium atom

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1
Who decides how long a second is? - John Kitching
All that was left was to determine how many ticks of a cesium atom
physics
колебания атома цезия
Повторяющиеся колебания атома, используемые как регулярные сигналы времени в атомных часах.
Who decides how long a second is? - John Kitching
B2
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