A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40. The rock now contains 3 mg of potassium-40. The half-life of potassium-40 is 1.3 billion years. From this information, you can conclude that the rock is approximately ______________ billion years old.
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A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40. The rock now contains 3 mg of potassium-40. The half-life of potassium-40 is 1.3 billion years. From this information, you can conclude that the rock is approximately ______________ billion years old.
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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).Suppose a scientist finds a rock with an interesting fossil. Curious to know the age of the fossil, she takes the rock to a lab. The lab determines the amount of rubidium (Rb) and strontium (Sr) in the rock. The scientist is familiar with radiometric dating and knows that she can now calculate the age of the rock, 1, using an isochron. The Rb-Sr isochron equation is 87. Rb. [edr – 1] 86 °Sr. 87 87 Sro 86 Sro 86 Sr. 87. Rb 3.807 and 89.60. In a published table, she finds that Using the lab's values, she calculates the isotope ratios as 86 Sr. 87 = 0.7129. She also finds that the decay constant, 86 the ratio of strontium-87 to strontium-86 at the formation of the rock was Sro 2, for rubidium-87 is 1.42 x 10-11. Use the equation and provided data to calculate t. Put your answer in scientific notation and round to the nearest tenth. years x10 What is the approximate age of the rock in billions of years? Round to the nearest tenth. billions of years t =Which item is best dated using the potassium-argon (K-Ar) method? Group of answer choices A: Cave layers in South Africa B: stone tools C: Ancient dinosaur bones D: organic materials E: Lava flows found in the Olduvai Gorge
- Which parent isotope is most useful for dating samples that are greater than 100 million years old? a potassium-40 b lead-206 c argon-40 d uranium-238The most useful method for dating ancient calcium rich cave deposits would be Group of answer choices A: Argon-Argon Dating B: Paleomagnetic Reversals C: Electron Spin Resonance Dating D: Uranium-Thorium Dating E: Potassium-Argon Dating"Carbon 14 decays to carbon12. The half-life of the C14 isotope is 5730 years. 22920 years after an animal dies, ______ carbon 14 will have been replaced with carbon12 and only _____ will remain in a bone sample from the animals skeleton found by the archaeologists. " "More than 99 percent, less than 1 percent" "Three fourths (75 percent), one fourth (25 percent)" "15/16ths (94 percent), 1/16 (6 percent)" "62/64ths (97 percent), 2/64 (3 percent)"
- Which of these factors influences the radioactive decay measured by radiometric dating? Temperature Half-life Pressure Chemical bonding stateMatch the reliable age range of the right with the appropriate technique on the left. Thermoluminescence [ Choose] Choose] Ages greater than 1,000 years ago. Ages between 1,000 years ago and 600 kya. Ages greater than 100 kya Ages between 300 BP and 300 kya. Ages between 0- 50 kya. [Choose ] Uranium-Thorium K-Ar (Potassium-Argon) Fission Track [ Choose ] Radiocarbon (14C) [Choose ]One problem in radiocarbon dating of biological samples, especially very old ones, is that they can easily be contaminated with modern biological material during the measurement process. What effect would such contamination have on the estimated age? Why is such contamination a more serious problem for samples of older material than for samples of younger material?
- 55: Radiometric dating ... Group of answer choices A: is based on the scientific observation that unstable “parent” isotopes decay into more stable “daughter” isotopes at a constant rate B: involves some event that initiates a radiometric clock, such as when a plant or animal dies (radiocarbon). C: has helped us determine that the Earth is roughly 4.54 billion years old. D: provides an accurate means of determining the age of materials that are very old. E: All of these answers are trueRadiometric dating _______. has a substantial error factor can only be used for dating animal fossils can be used to date sedimentary rock, but not fossils is basedon the premise that each isotope decays at a constant rate is unpredictable because of changes in temperature and pressurean abundance of ______________ in earth's early atmosphere would have interfered with assembly of organic compounds.