Concept explainers
a)
To evaluate: the amount of 0.2 − gram sample remains after 72 years.
a)
Answer to Problem 14PPS
The amount of 0.2−gram sample remains after 72 years is
Explanation of Solution
Given:
A radioactive element’s half life is the time it takes for one half of the element’s quanity to decay. The half-life of Plutonium-241 is 14.4years.
The number of grams A of Plutonium-241 left after t years can be modeled by
Model is given as,
So,
The amount of 0.2−gram sample remains after 72 years is
b)
To evaluate: the amount of 5.4 − gram sample remains after 1095 days.
b)
Answer to Problem 14PPS
The amount of 5.4−gram sample remains after 72 years is
Explanation of Solution
Given:
A radioactive element’s half life is the time it takes for one half of the element’s quanity to decay. The half-life of Plutonium-241 is 14.4years.
The number of grams A of Plutonium-241 left after t years can be modeled by
The 1095 days has 91.25 years.
Model is given as,
So,
The amount of 5.4−gram sample remains after 72 years is
Chapter 9 Solutions
Algebra 1
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