The approximate half life of Uranium 238 is 4.5 x 109 years.
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The approximate temperature of a plasma stream is typically around 10,000 to 100,000 degrees Celsius.
The approximate average energy for Ni-63 is around 67.4 keV.
The approximate mass of a standard-sized paper clip is about 1 gram.
Essentially all of the atom's mass is in the nucleus. In the lightest atom, that of hydrogen, it's about 99.95 percent. In the heaviest naturally occurring atom, that of Uranium238, it's about 99.979 percent.
The indicator of the approximate energy of light is called wavelength. It is inversely related to energy, with shorter wavelengths corresponding to higher energy light and vice versa.