Use this true story when teaching about time and distance:
Atomic Clock Isidor Rabi (1898-1988),
The atomic clock invented in 1949 measures natural resonance frequency of atoms.
The National Institute of Standards and Technology started using an atomic clock called NIST F-1 in Boulder Colorado 1999 to define time: A second is defined as 9,192,631,770 vibrations of a cesium atom. The clock will lose 1 second every 20 million years.
Atomic Clock Isidor Rabi (1898-1988),
The atomic clock invented in 1949 measures natural resonance frequency of atoms.
The National Institute of Standards and Technology started using an atomic clock called NIST F-1 in Boulder Colorado 1999 to define time: A second is defined as 9,192,631,770 vibrations of a cesium atom. The clock will lose 1 second every 20 million years.
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