Campbell Essential Biology with Physiology (5th Edition)
5th Edition
ISBN: 9780321967671
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece, Kelly A. Hogan
Publisher: PEARSON
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Chapter 14, Problem 8SQ
Summary Introduction
To determine: The age of a rock found by a paleontologist that contain 12 mg of the radioactive isotope potassium 40. The rock contains 3 mg of potassium 40 and half life of potassium 40 mg is 1.3 billion years.
Introduction: The half life time of a radioactive element can determine the age of a rock. Half life time is the interval time period which is required for the decay of an element to its half value from its initial value. It is denoted as T1/2.
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A fossil is found to contain the radioactive parent and daughter isotopes uranium 235U, and lead 207Pb, in the ratio 12.5% to 87.5%. Assuming that no 207Pb was present when the fossil first formed, estimate the age of this sample.Please show some thought process and a therefore statement. Thank you very much, have a great day!
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-238
Chapter 14 Solutions
Campbell Essential Biology with Physiology (5th Edition)
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- A scientist has a fossil that was found in a layer of rock close to Earth’s surface. He believes that the fossil is around 12,000 years old. Which method would best allow the scientist to confirm the actual age of the fossil? finding another fossil in a deeper layer of rock finding another fossil in the same layer of rock using carbon/nitrogen absolute dating using potassium/argon absolute datingarrow_forwardFact or theory? Organisms that look similar have been observed to have differences when preserved in rocks of different ages.arrow_forwardVolcanic ash can be used to date fossil finds because each time it is expelled by an eruption it has the same relative proportions of radioactive isotopes. True or Falsearrow_forward
- How do you think researchers and paleontologist determine where fossils of hominins are buried? answer must be at least 300 words in paragraph formatarrow_forwardTrue or false. The supercontinent pangaea formed about four billion years ago.arrow_forwardWhich statement is true? Recent remains of plants or animals on topsoil are fossils. Imprints of leaves or footprints in sedimentary rock are fossils. Insects preserved in hardened tree sap are not fossils. Petrified skeletal bones from an ancient mammal are not fossilsarrow_forward
- Question 1: Mass extinction ocurred on the following time and era except for: A. Mesozoic B. Precambrian C. Paleozoic D. Cenozoic E. All of the answers are correct Question 2: Why would Precambrian Time did not have a lot of fossils? A. fossils were destroyed by extreme heat and pressure. B. soft bodied animals do not leave a lot of fossils. C. majority of the fossils during Precambrian time underwent chemical transformation D. paleontologists haven’t recovered much of the remains of ancient organisms. Question 3: Transgenic organisms have also been developed for commercial purposes most importantly in the agricultural sector. Perhaps the most famous examples are food crops like soy and corn that are now highly resistant to various types of pests. These transgenic organisms are commonly produced by: A. addition, deletion of modification of genes B. gene sequences and programming C. inducing genetic mutations D. genetic transformation by bacteria E. identifying chromosomal…arrow_forwardWhich of the following geologic periods is not part of the Paleozoic Era? the Carboniferous Period the Cambrian Period the Cretaceous Period the Devonian Period the Ordovician Periodarrow_forwardIn radiometric dating, scientists use the half-life of a radioactive isotope, to determine the approximate age of rocks, and the fossils that are embedded in them. Half-life is the time it takes for half of a radioactive element to become stable.Uranium 238 (238U) is a radioactive element that decays into Lead (206Pb) after 4.5 billion years. 6) Scientists found a fossil in a layer of rock that tested as 1/8th U and 7/8th Pb. What is the approximate age of the fossil? A) 562 million years old B) 4.5 billion years old C) 9 billion years old D) 13.5 billion years old Not Gradedarrow_forward
- Which one of two radiometric dating methods that we studied in our course is useful for the identification of absolute age of buried organic remnants (bones, charcoal, woods)? Can you please help me with this questionarrow_forwardFill in the blanks. The parentheses after the blank represent the choices for each blank. ___________ (Pangaea, Gondwana) was a supercontinent that existed more than 500 million years ago. ___________ (Pangaea, Gondwana) was a supercontinent that began to form around 300 million years ago and broke up 100 million years later.arrow_forwardTrue or false? Wrinkly textures in rock that formed from ancient biofilms living in marine sediments are considered trace fossils.arrow_forward
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