Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 18.2, Problem 1TC
Uranium-235, with a half-life of 713 million years, decays to lead-207. If you analyze a rock and find that it contains uranium-235 and lead-207 in a ratio of 1:1, how old is the rock (assuming that decay of uranium-235 is the only source of lead-207)?
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Many radioactive isotopes are used in medicine for imaging and treatment purposes. The specific isotopes used depends on the particular organ or body system being studied (for example, Xe-133 is used to image lung function and blood flow.) Technetium-99m is a common radioactive isotope using for a variety of medical applications. It is produced from the decay of Molybdenum-99 and has a half-life of 6.01 hours.
What are some of the applications of Tc-99m?
While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73 hours. If it were easier to harvest, would this be a good substitute for Tc-99m? (remember to explain why for full credit)
While Tc-99m has a half-life of 6.01 hours, its decay product has a half-life of 213,000 years. While the medical community considers it to be reasonably safe, within the limits of testing, does this make sense considering both chemical and biological principles?
What are possible ways that you might deal with or…
The half-life of 1311 is 8.04 days.
(a) Convert the half-life to seconds.
(b) Calculate the decay constant for this isotope.
s-1
(c) Convert 0.550 µCi to the SI unit the becquerel.
|Bq
(d) Find the number of 1311 nuclei necessary to produce a sample with an activity of
0.550 μCi.
| 1311 nuclei
(e) Suppose the activity of a certain 131I sample is 7.10 mCi at a given time. Find the
number of half-lives the sample goes through in 40.2 d and the activity at the end of
that period. (Enter your answer for the number of half-lives to at least one decimal
place.)
half-lives
mCi
A 10.00 mg sample of technetium-93 (92.91024898 u) is used to heat 125.4 g of water from 23.4 degree C to 87.4 degree C. How many minutes will be required to heat the water if all of the energy generated from the decay is used to heat the water?
Chapter 18 Solutions
Biology
Ch. 18.1 - How Would the experiments result charge if oxygen...Ch. 18.1 - describe a likely scenario for the origin of life?Ch. 18.1 - describe, for each step in the scenario, some...Ch. 18.2 - Uranium-235, with a half-life of 713 million...Ch. 18.2 - Scientists have identified a free living bacterium...Ch. 18.2 - describe scenarios for the major evolutionary...Ch. 18.2 - State the order in which these events occurred,...Ch. 18.3 - describe fossil evidence of the earliest...Ch. 18.3 - describe the advantages that fostered the origin...Ch. 18.3 - Prob. 3CYL
Ch. 18.4 - Prob. 1TCCh. 18.4 - Does the mudskippers ability to walk on land...Ch. 18.4 - Can ancient DNA reveal the secrets of dinosaur...Ch. 18.4 - Although it may never be possible to recover DNA...Ch. 18.4 - describe the transitions and innovations...Ch. 18.4 - describe the advantages gained by the first plants...Ch. 18.5 - Scientists have cloned a number of animal species,...Ch. 18.5 - explain how extinction has affected the course of...Ch. 18.5 - describe the likely causes of mass extinctions in...Ch. 18.6 - We might be able to more easily distinguish...Ch. 18.6 - Paleontologists recently discovered fossil...Ch. 18.6 - describe the evolutionary history of humans and...Ch. 18.6 - name and describe some characteristics of the...Ch. 18.6 - describe the key features of the most recent phase...Ch. 18.6 - The unexpected discovery that humans interbred...Ch. 18 - Almost all of the oxygen gas in todays atmosphere...Ch. 18 - Extinction a. generally does not occur except...Ch. 18 - In the endosymbiotic origin of the mitochondrion,...Ch. 18 - Which of the following does not list evolutionary...Ch. 18 - Prob. 5MCCh. 18 - Because there was no oxygen in the earliest...Ch. 18 - The molecule _________ became a candidate for the...Ch. 18 - Complex cells that contain a nucleus and other...Ch. 18 - The Sperm of early land plants had to reach the...Ch. 18 - Prob. 5FIBCh. 18 - Prob. 6FIBCh. 18 - Prob. 7FIBCh. 18 - What is the evidence that life might have...Ch. 18 - How did the origin of photosynthesis affect...Ch. 18 - Explain the endosymbiont hypothesis for the origin...Ch. 18 - Name two advantages of multicellularity for plants...Ch. 18 - What advantages and disadvantages would...Ch. 18 - Prob. 6RQCh. 18 - Prob. 7RQCh. 18 - Extinctions have occurred throughout the history...Ch. 18 - In biological terms, what do you think was the...
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- Some scientists have speculated that life forms elsewhere in the universe could be based on silicon, rather than carbon. What properties does silicon share with carbon that makes this more likely than say aluminum-based life or neon-based life?arrow_forwardIf one of the planets in our solar system averages 0.723332 astronomical units from the sun, what is its orbital period (in Earth years, with one year = 365.256 Earth days)? the cubic root of (0.723332)1/2 = 0.947450 Earth years the square root of (0.723332)1/2 = 0.922220 Earth years the cubic root of (0.723332)1/3 = 0.964652 Earth years the square root of (0.723332)3 = 0.615186 Earth years the cubic root of (0.723332)2 = 0.805796 Earth yearsarrow_forwardThe figure below shows a comparison of the relative abundances of the most common elements found in the human body and the Earth's crust. Based on this graph, please answer the question below. Figure 2-4 percent relative abundance 70 60 50 m 20 10 human body Earth's crust HCON Ca Na P Al Si others and and Mg Karrow_forward
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