Second

Second (SI symbol: s), jske kabhi abhi sec. se abbreviate karaa jaawe hae, International System of Units (SI) base unit ke time ke measuement hae.

Aur dekho

• Atomic clock
• Becquerel
• Hertz
• International Atomic Time
• International System of Units
• Leap second
• Magneto-optical trap
• Time standard

External links

• National Physical Laboratory: Trapped ion optical frequency standards
• High-accuracy strontium ion optical clock; National Physical Laboratory (2005)
• National Research Council of Canada: Optical frequency standard based on a single trapped ion Archived 2008-03-14 at the 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
• Seconds and leap seconds by the USNO Archived 1996-11-26 at the Wayback Machine
• The leap second: its history and possible future
• What is a Cesium atom clock? Archived 2009-02-20 at the Wayback Machine