Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Question
Chapter 44, Problem 8PLA
To determine
The half-life of the radioactive sample in Question 6.
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For this question, CHOOSE THE CORRECT ANSWER, then explain your reasoning in the RATIONALE section below: Alpha, Beta-plus, Beta-minus and Gamma decay are all different forms of radio-Active decay. Suppose that a certain radioIsotope could emit TWO alpha particles, and its product (daughter nucleus) could then emit ONE beta-minus particle. The atomic number of the resulting element would be changed by
A. zero
B. minus 1
C. minus 2
D. minus 3
For questions no. 4 and 5. Given: Radium decomposed at a rate proportional to the quality
of radium present. Suppose that it is found that in 25 years approximately 1.10% of a
certain quantity of radium has decomposed. Determine approximately how long it will
take for ½ the original amount of radium to decompose.
4. The value of the constant of proportionality is
5. The amount of unconverted substance at any time t is given by
What is the half-life of this radioactive material (Barium 137) in seconds? Now, if we waited 8 half-lives, how many seconds would that be? What fraction of the original material would remain after that time? Explain how you decided on these answers.
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- The following reaction occurs when uranium 235 undergoes fission. Uranium 235 has an atomic mass of 235.044u. Niobium (Nb) has an atomic mass of 92.906u, and Antimony (Sb) has an atomic mass of 121.75u. n + 23592U = Nb +Sb +3n Show how you would calculate the mass difference. Which equation would you use to calculate the energy released in the fission event? Show your work in calculating the energy released in the fission event. How much energy was released by fissioning the Uranium in this manner?arrow_forward4 radioactive isotope has a half -life of 2 days. If the mass of the substance is initially 24 g, how much will remain after 6 days? Show your work.arrow_forwardRead the following items carefully. State your assumptions if any. Show your COMPLETE solution and BOX your final answers. Keep your answers and solutions in 4 decimal places. > Initially, 100 milligrams of a new radioactive substance Tobium, named after its discoverer Sir Tobs, was discovered and collected from one of the moons of Jupiter. After 6 hours from collection, the mass decreased by 4%, If the rate of decay IS proportional to the amount of the substance present at time t, find the amount of Tobium remaining after 48 hours.arrow_forward
- During early research in nuclear energy, why were scientists surprised that the products from splitting a uranium nucleus had less mass than the reactants? They expected that the large release of energy would cause an increase in mass. Up to that time, only chemical changes were known to form less mass than they started with. All known changes always started and ended with the same amount of mass. Other known nuclear changes resulted in the same mass of products as reactants. Next Submit Save and Exit Mark this and return centViewers/AssessmentViewer/Activit.arrow_forwardUse the graph in the figure below to find the half-life of isotope A. All you need is a sound understanding of the definition of half-life. 40 30 20 10 10 20 30 40 50 Time (days) Need Help? Read It Talk to a Tutor esc DII %23 % 1. 21 4. tab e r t Grams of radionuclidearrow_forwardDirections: Solve the following problems carefully. Write your detailed solutions on another sheet of paper. Please write it clearly so that I can understand 1.The half-life of an isotope is 5 years. What fraction of the isotope will remain after 20 years?arrow_forward
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