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Carbon-14 has a half-life of 5730 years. How long does it take a 200-gram sample of carbon-14 to decay to a mass of 100 grams?
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∙ 7y ago
5,730 years
Leone Wisozk
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What is the time needed for half of a sample of a radioactive isotope to break down to form daughter isotopes called?
halflife
How do you identify beta decay?
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125
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What is carbon14 dating?
when high energy cosmic rays bombard molecules in the upper atmosphere they produce fast moving neutrons. these neutrons collide with nitrogen atoms in the air producing tiny amounts of carbon-14 and hydrogen. a predictable amount of carbon will be transformed into c-14. carbon-14 then combines with oxygen and becomes carbon dioxide (co2) which diffuses to the earth and is absorbed by plants and then animals. carbon-14 starts to break down immediately upon being created at a steady and predictable rate. a measure of this rate is called it's half-life, that is the amount of time it takes half of a sample to disintegrate (5568 years for c-14). by measuring the amount of c-14 left in a sample compared to the initial occurrence of it, we can deduce the age of that object (ie. if 12.5%, or 1/2 of 1/2 of 1/2, of the c-14 remains the object is 16704 years old). note; for objects that do not contain carbon-14 (ie. inorganics) this dating method cannot be used
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The length of time depends on the element and isotope, but the point at which half of the sample has decayed is known as the half-life.
How many milligrams of a 15.0 mg sample of radium-226 remain after 6396 years if the half-life of radium-226 is 1599?
One sixteenth of a gram. 1st halflife- 1/2 gram 2nd, 1/4 3rd 1/8th 4th halflife, 1/16th
A sample of radioactive isotope has a halflife of 1 day how much of the original sample will be left at the end of the fourth day?
If a sample of radioactive material has a half-life of one week the original sample will have 50 percent of the original left at the end of the second week. The third week would be 25 percent of the sample. The fourth week would be 12.5 percent of the original sample.
Difference between random sample and convenience sample?
random sample is a big sample and convenience sample is small sample
What is the difference between sample and sample size?
a sample is a sample sized piece given... a sample size is the amount given in one sample
