
(a)
Interpretation : Radioactive copper-64 decays with a half-life of 12.8 days. Then the value of k in s-1 is to be determined.
Concept Introduction : The time required to disintegrate exactly half of the radioactive substance is called half-life period.
(b)
Interpretation: Asample having 28.0mg 64Cu then decay events produced in first second is to be calculated. Considering the
Concept Introduction:Spontaneous breakdown of an atomic nucleus and results in release of energy from nucleus is called radioactive decay.
(c)
Interpretation: The time required to decrease the radioactivity below 25% of the initial measured value needs to be determined.
Concept Introduction : The rate law equation for first order reaction is as follows:
Where;
C0 = initial radioactivity at t= 0
C = radioactivity at time t
k = rate constant
t = time

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Chapter 20 Solutions
EBK CHEMICAL PRINCIPLES
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