Where was the first practical atomic clock built in 1949, utilizing the cesium atom?
Answer
US National Bureau of Standards (NIST)
The final evolution in timekeeping accuracy, moving beyond mechanical drift, was achieved by harnessing the stable resonance of atoms. The development phase spanned the 1920s and 1930s, but the realization of a functional device came later. The very first practical atomic clock, which employed the rapid oscillations of the cesium atom, was constructed in 1949 at the US National Bureau of Standards, which is now known as NIST. This milestone set the stage for redefining the fundamental unit of time itself, eventually leading to the official 1967 definition of the second based on the cesium-133 atom's resonance frequency.
#Videos
HISTORY OF TIME KEEPING | 2nd Grade - Science - YouTube
Related Questions
Which numeral system developed by Babylonians gifted us the division of the minute into 60 seconds?What inherent flaw limited the uniform measurement capability of the Egyptian clepsydra?What component was critical for allowing weight-driven mechanical clocks to count uniform intervals in medieval Europe?Which scientific property did Christiaan Huygens apply in 1656 to create the first truly accurate pendulum clock?What major navigational challenge was solved by John Harrison's H4 marine chronometer in the 1760s?The official definition of one second is based on how many cycles of the cesium-133 atom?Why were the simple vertical markers used by early civilizations, precursors to the sundial, inherently flawed for time organization?Where were the first weight-driven mechanical clocks commonly installed around the late 13th century?Where was the first practical atomic clock built in 1949, utilizing the cesium atom?What key 19th-century developments necessitated the move toward standardized time zones beyond local solar time?