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best radioactive dating worksheet middle school pdf - Reading Comprehension Worksheets
Radioactive Dating Worksheet Below are several problems based on radioactive decay. Your job is to determine how old the rock/ fossils are based on the amounts of radioactive materials in their composition. Read the following problems and use the half-life of each element to help you decide the age of each artifact. Half-lives Carbon 14 ------ 5730 years Uranium 235---- 713 million years Potassium 40---- 1.3 billion years 1.) Scientists found a fossilized bone from an organism in a deep layer of rock.
When they took the bone back to the lab they realized that the bone had only 12.5% of the total carbon 14 left. Based on the amount of carbon 14 left in the bone how old is the bone? 2.) In the picture below the igneous intrusion (V) was examined and scientists found that this rock had about 25% of the overall uranium 235 left in the composition of the rock.
This fact helps scientists determine how old the intrusion is and in turn will give clues about the age of the rock layers around and beneath the intrusion. Using the amount of uranium 235 left in the intrusion how old is the intrusion? What are the relative ages of the rock layers and fossils around and beneath the intrusion? 3.) If a rock was determined to be around 3.9 billion years old how much potassium 40 would be left in that rock sample?
(Percentage of Potassium 40) Radioactive Dating—Practice Using the graph below, answer questions 1-4. 1. Estimate the half-life for radioactive potassium. 2. If a rock layer has 200 mg of radioactive potassium, how old is it? 3. If another rock layer has 600 mg of radioactive potassium, estimate the age of the rock layer. 4. If a rock layer is 25,000 years old, how many mg of radioactive potassium does it have? time vs. g of potassium 40 1,200 g of potassium 40 1,000 800 600 400 200 0 0 2 4 6 8 time passed (billion years) 5.
Fill in the table below. ½ life 0 1 mg of radioactive californium 200 time (years) 0 5,000 10 Comments
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Nuclear Half Life: Intro and Explanation