21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 8, Problem 5QP
To determine
The fraction of radioactive element left in a rock after 40000 years from the given options.
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A rock sample which originally contained 400 grams of radioactive isotope X now contains 25 grams of the material. The half-life of isotope X is 10,000 years. How old is the rock sample? (Give your answer without any punctuation or lables. For example: 15000).
What is carbon-14 dating?
1. Calculate the age of the fossil given that the amount of 14C found in it is 92 percent of that in living tissue. Carbon-14 has a half life of 5730 years ?
Chapter 8 Solutions
21st Century Astronomy
Ch. 8.1 - Prob. 8.1CYUCh. 8.2 - Prob. 8.2CYUCh. 8.3 - Prob. 8.3ACYUCh. 8.3 - Prob. 8.3BCYUCh. 8.4 - Prob. 8.4CYUCh. 8.5 - Prob. 8.5CYUCh. 8.6 - Prob. 8.6CYUCh. 8 - Prob. 1QPCh. 8 - Prob. 2QPCh. 8 - Prob. 3QP
Ch. 8 - Prob. 4QPCh. 8 - Prob. 5QPCh. 8 - Prob. 6QPCh. 8 - Prob. 7QPCh. 8 - Prob. 8QPCh. 8 - Prob. 9QPCh. 8 - Prob. 10QPCh. 8 - Prob. 11QPCh. 8 - Prob. 12QPCh. 8 - Prob. 13QPCh. 8 - Prob. 14QPCh. 8 - Prob. 15QPCh. 8 - Prob. 16QPCh. 8 - Prob. 17QPCh. 8 - Prob. 18QPCh. 8 - Prob. 19QPCh. 8 - Prob. 20QPCh. 8 - Prob. 21QPCh. 8 - Prob. 22QPCh. 8 - Prob. 23QPCh. 8 - Prob. 24QPCh. 8 - Prob. 25QPCh. 8 - Prob. 26QPCh. 8 - Prob. 27QPCh. 8 - Prob. 28QPCh. 8 - Prob. 29QPCh. 8 - Prob. 30QPCh. 8 - Prob. 31QPCh. 8 - Prob. 32QPCh. 8 - Prob. 33QPCh. 8 - Prob. 34QPCh. 8 - Prob. 35QPCh. 8 - Prob. 36QPCh. 8 - Prob. 37QPCh. 8 - Prob. 38QPCh. 8 - Prob. 39QPCh. 8 - Prob. 40QPCh. 8 - Prob. 41QPCh. 8 - Prob. 42QPCh. 8 - Prob. 43QPCh. 8 - Prob. 44QPCh. 8 - Prob. 45QP
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- Carbon-14 dating measures the ratio of carbon-14 not to its daughter, nitrogen-14, but instead to what isotope?arrow_forwardMetamorphic rock shows that only 25% of its original potassium-40 remains. What is the minimum age of the rock? The half-life of K-40 is 1.3 billion years.arrow_forwardA piece of fossilized wood has a carbon 14 radioactivity that is one eighth that of new wood. The half-life of carbon-14 is 5730 years how old is the wood?arrow_forward
- You want to use radiometric dating to determine the age of a specimen. You use Isotope Z, which has a half-life of 645 years. You measure your sample and find that 1/16 of the original amount of Isotope Z is present. How old is the sample?arrow_forwardExample of radioactive datingarrow_forwardA fossilized leaf contains 70% Of its normal amount of carbon- 14. How old is the fossil? Use 5730 yesrs as the half-life of carbon- 14.arrow_forward
- About how many days on the geologic time calendar were the dinosaurs present? To how many years does this correspond?arrow_forwardReview. The North American and European plates of the Earths crust are drifting apart with a relative speed of about 25 mm/yr. Take the speed as constant and find when the rift between them started to open, to reach a current width of 2.9 103 mi.arrow_forwardWhat is obtained when rocks and geologic events are put into chronologic order without regard to the actual dates? (24.2) (a) absolute (numerical) geologic time (b) relative geologic time (c) a geologic formation (d) a correlation periodarrow_forward
- Suppose that one species of index fossil lived between 410 and 380 mya and another lived between 440 and 350 mya. What can be said about the age of a rock that contains fossils of both species? Figure 24.22 Absolute Dating of Sedimentary Rocks See Exercise 7.arrow_forwardWhat is "half-life"? Select one: a. The time needed for half of the radioactive atoms in a sample to decay b. the time needed for a radioactive atom to lose half its energy c. the time needed for the mass of a radioactive atom to decrease by one-halfarrow_forwardA rock sample contains a radioactive isotope that has a half-life of 10,000 years. One-fourth (25%) of the parent isotope remains in a sample. How old is the sample?arrow_forward
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