Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 16, Problem 7SQ
If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is ______ years old.
- a. 15,000
- b. 26,667
- c. 30,000
- d. 40,000
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Life first appeared on Earth ___________ of years ago.Choose one:
A. billions
B. hundreds of thousands
C. thousands
D. millions
Radioisotopes are useful in dating fossils and rocks because
a.
they are present in very high amounts.
b.
they decay rapidly.
c.
they decay in a predictable pattern over long time period.
d.
their rate of decay changes over time.
Which of the following was likely MOST important for life to begin existing on Earth?
A.
sunlight
B.
DNA
C.
a source of oxygen
D.
a source of energy
Chapter 16 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 16 - The number of species on an island depends on the...Ch. 16 - Prob. 2SQCh. 16 - Prob. 3SQCh. 16 - A trait is adaptive if it ______. a. arises by...Ch. 16 - Prob. 5SQCh. 16 - Discovery of Iridium in the K-Pg Boundary Sequence...Ch. 16 - Prob. 2DAACh. 16 - Which of the following is a fossil? a. an insect...Ch. 16 - If the half-life of a radioisotope is 20,000...Ch. 16 - Prob. 8SQ
Ch. 16 - The dinosaurs died out ______ million years ago.Ch. 16 - On the geologic time scale, life originated in the...Ch. 16 - Prob. 11SQCh. 16 - Forces that cause geologic change include ___...Ch. 16 - Radiometric dating does not measure the age of an...Ch. 16 - If you think of geologic time spans as minutes,...
Additional Science Textbook Solutions
Find more solutions based on key concepts
Sea turtles have disappeared from many regions, and one way of trying to save them is to reintroduce them to ar...
MARINE BIOLOGY
6. How can you use the features found in each chapter?
Human Anatomy & Physiology (2nd Edition)
Why is it necessary to be in a pressurized cabin when flying at 30,000 feet?
Anatomy & Physiology
Consider the experiment described in Section 2.1 in which Ted Garland and colleagues bred mice to run long dist...
Evolutionary Analysis (5th Edition)
Which of the following would be used to identify an unknown bacterial culture that came from a patient in the i...
Microbiology Fundamentals: A Clinical Approach
Review the Chapter Concepts list on page 422. These all center on quantitative inheritance and the study and an...
Essentials of Genetics (9th Edition) - Standalone book
Knowledge Booster
Learn more about
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
- The 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 Datingarrow_forwardRadiometric dating is a technique used to determine the age of rocks. Geologists have used this technique to determine that: A. The universe started with the "Big Bang." B. Earth is about 6.2 trillion years old, and life appeared on Earth about 4.9 trillion years ago. C. Earth is about 4.6 billion years old, and life appeared on Earth about 4.1 billion years ago. D. Earth is about 4.6 million years old, and life appeared on Earth about 4.4 million years ago. E. Earth is about 6.2 thousand years old, and life appeared on Earth about 6 thousand years ago.arrow_forwardSuppose 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 =arrow_forward
- Approximately when did life first appear on land A. 500 million years ago B. 2 billion years ago C. 700 million years D. 1.5 million years agoarrow_forwardThe earliest evidence for life is closest to what age? OA. 5.4 Ga OB. 15 Ga O C. 600 Ma OD. 3.25 Gaarrow_forwardThis was one of Galileo’s observations? A. Venus goes through phases B. Our sun orbits the center of our galaxy C. The orbit of Jupiter is an ellipse D. Four Moons orbit Venus E. The moon rotatesarrow_forward
- What was a significant result of the Mars Phoenix project?a. culturing bacteriab. verifying waterc. finding organic matterd. discovering precious metalsarrow_forwardwhich term describes any ancient remains, impressions, or traces of an organism or traces of its activity that have been preserved in rocks or other mineral deposits in Earth’s crust? a. analogous feature b. homologous feature c. mutation d. fossilarrow_forwardWhich 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 Gorgearrow_forward
- Choose the answer from the given concept below. A. Extraterrestial Origin B. Divine Creation C. Spontaneous Origin D. Big bang theory 1. this is the oldest among life's origin theories and the most accepted among others. It may vary vary on the practice of a religion, but it's commonality is that a Divine God created life. It is called the 2.Meteorite contains amino acids, nucleotide bases and sugar. Hundreds of thousands of meteorites and comets are known to have fallen into the early Earth, suggesting that it may contain some organic material. It is referred as the 3. Greek philosopher Aristotle proposed a theory eith the idea that living matter may arise from non-living matter. These are based on early observations such as the appearance of maggots in rotting meat, mice on corn and fish from mud of previously dry lakesarrow_forwardA sample of a igneous rock contains small amounts of radioactive potassium and argon. Using the ratio of 40Ar to 40K, it is determined that only 25% of the original parent isotope remained. How old is this rock sample? Please include thought process and a therefore statement. Thank you very much, have a good day!arrow_forwardWhat is examined to do relative dating? A. Layers of sediment B. Uranium deposits C. Carbon-14 deposits O D. Radioactive materialsarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Necrosis vs. Apoptosis: Cell Death; Author: AMBOSS: Medical Knowledge Distilled;https://www.youtube.com/watch?v=zFrBwGfOQs0;License: Standard Youtube License