Segundo
An Segundo amo an usa ka yano nga sukol han oras ha Kanasodnon Sistema han mga Panukol o SI (tikang ha Frinanses nga le Système international d'unités.
Pinanbasaran
[igliwat | Igliwat an wikitext]Mga sumpay ha gawas
[igliwat | Igliwat an wikitext]
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An Wikimedia Commons mayda media nga nahahanungod han: Segundo |
- National Physical Laboratory: Trapped ion optical frequency standards Ginhipos 2009-02-14 han Wayback Machine
- High-accuracy strontium ion optical clock; National Physical Laboratory (2005)
- National Research Council of Canada: Optical frequency standard based on a single trapped ion Ginhipos 2008-03-14 han Wayback Machine
- NIST: Definition of the second; notice the cesium atom must be in its ground state at 0 K
- Official BIPM definition of the second
- The leap second: its history and possible future
- What is a Cesium atom clock? Ginhipos 2009-02-20 han Wayback Machine