Categories
- Art (356)
- Other (3,632)
- Philosophy (2,814)
- Psychology (4,018)
- Society (1,010)
Recent Questions
- Why did everyone start to hate the Russians if the U.S. did the same thing in Afghanistan, Iraq?
- What needs to be corrected in the management of Russia first?
- Why did Blaise Pascal become a religious man at the end of his life?
- How do I know if a guy likes you?
- When they say "one generation", how many do they mean?
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 %.