Jan 29, 2014 · Another 1.3 billion years and you have half of what's left a quarter of the original. Another 1.3 billion years and you have half of what's left half of that quarter, or an eighth of the original. Another way to figure it out is to divide 3.9 by 1.3 and then multiply 1/2 by itself that number of times. 3.9 / 1.3 = 3. So 1/2 x 1/2 x 1/2 = 1/8. Mar 09, 2011 · Best Answer: At 1.3 there will be 1/2. At 2.6 there will be 1/4. At 3.9 there will be 1/8 left of the material! Dec 16, 2014 · Half of an American billion is 500,000,000 500 million. Half of a British billion is 500,000,000,000 500 thousand million. If a radioactive isotope has a half life of 1.3 billion years after 3.9 billion years how much of the parent material will be left?

Oct 30, 2010 · Half of an American billion is 500,000,000 500 million. Half of a British billion is 500,000,000,000 500 thousand million. One percent of one billion is 10 million. "Percent" is short for "per 100," so "one percent" is the same as "one per 100." To find one percent of any number, simply divide by 100. Percentage is a ratio expressed as a fraction with 100 in the denominator. Fifty percent is the same as 50/100, which reduces to 1/2.

What is one percent of one billion? Hi Charles, One percent is "one per one-hundred", that is 1 / 100. Your email address indicates that you are from the United States so a billion is 1,000,000,000. In Britain a billion is 1,000,000,000,000. Hence one percent of a billion is 1 / 100 1,000,000,000 = 10,000,000 Penny Go to Math Central. argon method potassium 40 has a half life of 1.3 billion years, and it decays leaving a daughter material of argon. This method is used mainly to date rocks older than 100,000 years old.

A rock sample from the moon includes a mineral that contains small amounts of the radioactive isotope Potassium-40 and its daughter element Argon-40 half-life of 1.3 billion years. This mineral would not form with any Argon-40. Consider a crystal with 7 atoms of Argon-40 for every 1 atom of Potassium-40. Jul 03, 2014 · 1 Answer.After another 1.3 billion years two half lives or 2.6 billion years 45 /2 = 22.5mg decays and 22.5 mg remains left. After another 1.3 billion years three half lives or 3.9 billion years 22.5 /2 = 11.25mg decays and 11.25g remains left. after three half lives or 3.9 years, 11.25 mg will be left.

Nov 29, 2015 · One billion and a half is potentially ambiguous, it could be interpreted with arguments either way you've written it. I would tend to the 1,000,000,000.5 except that usually you won't go to precision of a half when you have a large number like th. Oct 12, 2017 · Radioactive Decay The half-life of radioactive potassium is 1.3 billion years.If 10 grams is present now,how much will be present in 100 years? In 1000 years? Oct 07, 2017 · Suppose you find a rock originally made of potassium-40, half of which decays into argon-40 every 1.25 billion years. You open the rock and find.

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