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How many weeks in two and a half years?
There are 52 weeks in a year, and therefore 26 weeks in a half year.52 + 52 + 26 = 130 weeks in two and a half years.i googled how many weeks are in 2 years and it gave me 104.354914. and i divided it in half and added it to 104.354914. and i got 156.532371
What percent of potassium-40 remains after two half-lives?
25%
How many half-lives will it take for all but 25 percent of the original C-14 to decay?
39
How many years does growth spurt last?
The average male growth spurt lasts for two years, and the average female growth spurt for two to two and a half years. These are only averages, and individuals may experience different lengths of maximum growth.
How many eggs are in two and one half dozen?
30 eggs are in two and a half dozens.
How many lives does a duck have?
two years or twevle years
How many weeks are in two in a half years?
130
How many half-lives have passed if 12.5 of a radioactive sample are left?
3 At the end of the first half life, there will theoretically be 50% remaining. 2 half lives: 25% 3 half lives:12.5 %
How many years left till 2014?
From mid-2011, about two and a half.
How many weeks in two and a half years?
There are 52 weeks in a year, and therefore 26 weeks in a half year.52 + 52 + 26 = 130 weeks in two and a half years.i googled how many weeks are in 2 years and it gave me 104.354914. and i divided it in half and added it to 104.354914. and i got 156.532371
How many days is 7billion years?
2556697500000 days (about two and a half trillion days)
How many light years does it take to travel two and half earth years?
Light years are a measure of distance, earth years are a measure of time. The two can't be compared like this.
What two 'light' elements have no stable nonradioactive isotopes?
The two elements are elements 43, Tc, technetium, and 61, Pm, promethium. Technetium has a few "nearly stable" isotopes with half-lives of over a million years. Promethium's longest lived isotope has a half-life of about 20 years.
What would the percent of any element after two half lives?
25%
After two half-lives, how much of the original material has decayed?
75%
What percent of potassium-40 remains after two half-lives?
25%
If a radioactive sample has decayed until only one eighth of the original sample remains unchanged how many half-lives have elapsed?
This depends on the type of material. Uranium-238's half-life is 4,438,000,000 years. But the half-life of a material such as Radon-218 is only 35 ms. There is a great range of half-lives for a wide variety of isotopes, so it is impossible to generalize. If you're asking what a half-life is, it is the amount of time it takes for half of any quantity of a radioactive isotope to decay. So if you had a 10g pile of Uranium-238, after 4,438,000,000 years, only 5g of it would still be Uranium-238. The other half would've decayed.
