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Thorium-234 has a mean lifetime of 3 × 10 6 seconds, so there is equilibrium if one mole of 238 U contains 9 × 10 12 atoms of thorium-234, which is 1.5 × 10 −11 mole (the ratio of the two half-lives). Similarly, in an equilibrium in a closed system the amount of each decay product, except the end product lead, is proportional to its half-life.
The number of Muslim-Americans indicted for support of terrorism also fell, from 27 individuals in 2010 to just eight in 2011 (the total since 9/11 stands at 462). [ 239 ] [ 240 ] Also in apparent decline is the number of actual attacks: Of the 20 suspects indicted for terrorism, only one was charged with carrying out a terrorist act.
As opposed to the year, month, and day format of the Gregorian calendar, the GPS date is expressed as a week number and a seconds-into-week number. The week number is transmitted as a ten-bit field in the C/A and P(Y) navigation messages, and so it becomes zero again every 1,024 weeks (19.6 years). GPS week zero started at 00:00:00 UTC (00:00: ...
Retirement is the withdrawal from one's position or occupation or from one's active working life. [1] A person may also semi-retire by reducing work hours or workload. Many people choose to retire when they are elderly or incapable of doing their job for health reasons. People may also retire when they are eligible for private or public pension benefits, although some are forced to retire when ...