الرئيسية » أرشيف الوسم : apex

أرشيف الوسم : apex

ammonia clock

ammonia clock A form of atomic clock in which the frequency of a quartz oscillator is controlled by the vibrations of excited ammonia molecules. The ammonia molecule (NH3) consists of a pyramid with a ni­trogen atom at the apex and one hy­drogen atom at each corner of the triangular base. …

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