Quote:
Originally Posted by Apache
The first accurate watch was the Bulova Accutron. It used a tuning fork that resonated at a specific frequency.
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360 Hz
The Seiko Quartz-Astron 35SQ ran at 8192 (2^13) Hz.
Since then 32768 (2^15) Hz has become the standard even for computer clocks.
Rubidium clocks run at 6.834682610904 GHz.
Cesium clocks run at 9.192631770 GHz.
Hydrogen masers run at 1.420405752 GHz.