Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Chapter 44, Problem 6PLA
To determine
The remaining number of nuclei present in the sample after one hour.
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The actinide series of elements are all radioactive. They all experience alpha decay. A
sample with Z=103 undergoes alpha decay. How many protons does the daughter
nucleus have? NOTE: You do NOT have to show your work for this problem.
Problem 9: Answer the following questions based on the graph of a radioactive iodine isotope shown to the right.
Part (a) What is the half-life of the material in days?
t = _________ days
Part (b) In how many days does the substance decay to one-fourth its original value?
t = _________ days
Measurements of a certain isotope tell you that the
decay rate decreases from 8322 decays/minute
to 3162 decays/minute over a period of 4.50
days
K
▼
Part A
What is the half-life T1/2 of this isotope?
Express your answer numerically, in days, to three significant figures.
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- (a) Calculate the energy released in the a decay of 238U . (b) What fraction of the mass of a single 238U is destroyed in the decay? The mass of 234Th is 234.043593 u. (c) Although the fractional mass loss is large for a single nucleus, it is difficult to observe for an entire macroscopic sample of uranium. Why is this?arrow_forward(a) Write the decay equation for the decay of 235U. (b) What energy is released in this decay? The mass of the daughter nuclide is 231.036298 u. (c) Assuming the residual nucleus is formed in its ground state, how much energy goes to the particle?arrow_forwardThe atomic weight of cadmium is 112.41, and its density is 8.65 g/cm3. Using Figure 14.3, estimate the attenuation distance of a thermal neutron beam in cadmium. (The attenuation distance is the distance traveled after which the intensity of the beam is reduced to 1/e of its initial value, where e is the base of the natural logarithms.)arrow_forward
- Determine the half-life (in s) of a radioactive sample that has a decay rate of 3.30 ✕ 1011 Bq when it contains 1.70 ✕ 1015 nuclei. sarrow_forwardSolve problem 17 by using equation (2,2) and the k value determined by solving 16.arrow_forwardThe number of radioactive nuclei present at the start of an experiment is 5.38 × 10¹5. The number present twenty days later is 5.02 × 10¹4. What is the half-life (in days) of the nuclei?arrow_forward
- A certain radioactive isotope has a decay constant of 0.00324 s-1. 1) Find the half-life in seconds. (Express your answer to three significant figures.) 2) Find the half-life in days. (Express your answer to three significant figures.)arrow_forwardWhat is the activity of a sample of C that contains 5.3x1020 nuclei? The half-life of C is 5700 years. Express your answer using two significant figures. ? ΔΝ decays/s Atarrow_forward15O and 131I are isotopes used in medical imaging. 15O is a beta-plus emitter, 131I is a beta-minus emitter. What are the daughter nuclei of the two decays? Express your answers as isotopes separated by a comma. Enter your answer using the number in superscript in front of the element.arrow_forward
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