Concept explainers
(a)
The percentage of the activity of
(a)
Answer to Problem 85P
The percentage of the activity of
Explanation of Solution
Radioactive
Write the formula for the activity
Here,
Conclusion:
Substitute
The percentage of decrease in the acitivity is
Thus, the percentage of the activity of
(b)
The power output initially and after
(b)
Answer to Problem 85P
The power output initially is
Explanation of Solution
The energy of
Write the formula for half-life
Here,
Write the formula for the initial number of nuclei
Here,
Write the formula for the initial activity
Here,
Write the formula for power output
Here,
Conclusion:
The half-life of
Substitute
The initial number of atoms is
Substitute equation (I) in (III) and solve for
Substitute
The initial activity is
Substitute
The initial power output is
The power output after
The power output after
Thus, the power output initially is
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Chapter 29 Solutions
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