What is 1second? what is 1meter? please tell me in physics language
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1metre-A Metre was originally defined as the distance between two marks drawn on a platinum-iridium (an alloy with 90% platinum and 10% iridium) rod
kept at 0°c in the international bureau of weights and measures at Sevres near Paris.
IT was re-defined in terms of speed of light acc.to which 1m is the distance travelled by the light in 1/299,792,458 of a second in vacuum.
1second-it is the time interval of 9,192,631,770 vibrations of radiations corresponding to the transition b/w two hyperfine levels levels of the ground state of the cesium-133 atom.
kept at 0°c in the international bureau of weights and measures at Sevres near Paris.
IT was re-defined in terms of speed of light acc.to which 1m is the distance travelled by the light in 1/299,792,458 of a second in vacuum.
1second-it is the time interval of 9,192,631,770 vibrations of radiations corresponding to the transition b/w two hyperfine levels levels of the ground state of the cesium-133 atom.
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