
Concept explainers
(a)
The edge dimension of the cube.
(a)

Answer to Problem 62AP
The edge dimension of the cube is
Explanation of Solution
Write the equation for volume of a cube.
Here,
Write the equation connecting mass, density and volume.
Here,
Write the equation for the edge dimension of the cube from equations (I) and (II).
Conclusion:
Substitute
Thus, the edge dimension of the cube is
(b)
The net decay energy.
(b)

Answer to Problem 62AP
The net decay energy is
Explanation of Solution
Write the given reaction.
Add 92 electrons on both sides of the reaction to obtain the new nuclear reaction.
Write the equation for Q value.
Conclusion:
Substitute
Thus, the net decay of energy is
(c)
Prove that the power output
(c)

Answer to Problem 62AP
The power output is
Explanation of Solution
The number of decays per second is equal to the decay rate given by
The energy released in each decay is
Conclusion:
The energy released per unit time interval is the power output.
Write the equation for the power output.
Thus, the power output is
(d)
The power output due to the radioactivity of the uranium and its daughters.
(d)

Answer to Problem 62AP
The power output due to the radioactivity of the uranium and its daughters is
Explanation of Solution
Find the amount of the nuclei.
Write the equation for the decay constant.
Here,
Write the equation for the rate of decay.
Here,
Write the equation for the power output.
Here,
Conclusion:
Substitute
Substitute
Substitute
Thus, the power output due to the radioactivity of the uranium and its daughters is
(e)
The rate per year at which the person absorb the energy of
(e)

Answer to Problem 62AP
The rate per year at which the person absorb the energy of radiation is
Explanation of Solution
Find the dose in rad/yr.
Here,
Write the equation for the allowed whole-body dose.
Conclusion:
Substitute
Substitute
Thus, the rate per year at which the person absorb the energy of radiation is
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Chapter 43 Solutions
Physics for Scientists and Engineers with Modern Physics
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