Why does a second last exactly as long as it does? By Armen Khatayan Posted on 2022-11-03 Category : Philosophy
A second is equal to: 9,192,631,770 periods of radiation from the ground state of caesium-133, which, respectively, makes transitions between two ultrafine levels. Since the isotopic abundance of caesium-133 in nature is about 100 %. Log in to Reply
A second is equal to: 9,192,631,770 periods of radiation from the ground state of caesium-133, which, respectively, makes transitions between two ultrafine levels. Since the isotopic abundance of caesium-133 in nature is about 100 %.