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myohmyohmy
20.04.2021 •
Physics
Calculate the energy (in MeV) released in the decay of 239Pu. (Assume 1 u = 931.5 MeV/c2.) MeV (b) What fraction of the mass of a single 239Pu is destroyed in the decay? The mass of 235U is 235.043924 u.
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Ответ:
m
Explanation:
Ответ:
75.8 %
Explanation:
Half-life of tritium= 12.33 years
First we have to calculate the rate constant, we use the formula :
Now we have to calculate the age of the sample:
Expression for rate law for first order kinetics is given by:
where,
k = rate constant =![0.056\text{years}^{-1}](/tpl/images/0182/3360/bdf2b.png)
t = age of sample = 5 years
a = let initial amount of the reactant = 100 g
a - x = amount left after decay process = a g
Now put all the given values in above equation, we get
Thus 75.8 percentage of a sample will remain after 5 years have passed.