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4.5 × 1015 J
A stable isotope does not have a half-life because of the definition of stable versus radioactive. It is stable, and does not decay; thus, it has no half-life. Only unstable, i.e. radioactive isotopes have half-lives. There are some isotopes that are thought to be unstable, but for which we have been unable to measure the half-life because it is so long. These are examples of some of the primordial nuclides, such as Ta-180m, estimated to have a half-life in excess of 1015 years, far longer than the known age of the universe.
Yes. Cadmium is radioactive, with over 50% made up of radioactive isotopes, though the half lives so very long that they can be treated as stable for most purposes.Naturally occurring cadmium is composed of 8 isotopes. For two of them, natural radioactivity was observed, and three others are predicted to be radioactive but their decay is not observed, due to extremely long half-life times. The two natural radioactive isotopes are 113Cd (beta decay, half-life is 7.7 × 1015 years) and 116Cd (two-neutrino double beta decay, half-life is 2.9 × 1019 years). The other three are 106Cd, 108Cd (double electron capture), and 114Cd (double beta decay); only lower limits on their half-life times have been set. At least three isotopes - 110Cd, 111Cd, and 112Cd - are stable. Among the isotopes absent in natural cadmium, the most long-lived are 109Cd with a half-life of 462.6 days, and 115Cd with a half-life of 53.46 hours. All of the remaining radioactive isotopes have half-lives that are less than 2.5 hours, and the majority of these have half-lives that are less than 5 minutes. This element also has 8 known meta states, with the most stable being 113mCd (t½ 14.1 years), 115mCd (t½ 44.6 days), and 117mCd (t½ 3.36 hours).No, Cadmium is not radioactive, though it is toxic.There are, however, several radioactive isotopes of cadmium.
Rigel is about 860 light years from us.That equates to:5.05550984 × 1015 miles8.13605443 × 1015 kilometres54,386,117 AU.
"f" stands for femto, which is 1015 power.
4.5 × 1015 J
0.02 kg
4.5 × 1015 J
0.02kg
Passions - 1999 1-1015 was released on: USA: 1 July 2003
Days of Our Lives - 1965 1-1015 was released on: USA: 19 November 1969
Santa Barbara - 1984 1-1015 was released on: USA: 11 August 1988
Dark Shadows - 1966 1-1015 was released on: USA: 15 May 1970
From a tiny fraction of a second (10-18 seconds or so) to more than 1015 years.
Sit and Be Fit - 1987 Sensory Awareness 10-1015 was released on: USA: 15 September 2008
Late Night with Jimmy Fallon - 2009 1-1015 was released on: USA: 20 June 2013
2023-1015 = 1008