According to the text, what is the correct formula for obtaining the activity (A) of a radioactive material? a. A = dN/dt, where dN is the expecte...
According to the text, what is the correct formula for obtaining the activity (A) of a radioactive material?
a. A = dN/dt, where dN is the expected value of the number of spontaneous nuclear transitions of that energy state in the time interval dt.
b. A = dN/da, where dN is the number of particles on a sphere of area section measured in m-2.
c. A = dN/dm, where dN is the number of particles on a sphere of mass section measured in kg.
d. A = dN/dV, where dN is the number of particles on a sphere of volume section measured in m3.
e. A = dN/dE, where dN is the number of particles on a sphere of energy section measured in eV.
a. A = dN/dt, where dN is the expected value of the number of spontaneous nuclear transitions of that energy state in the time interval dt.
b. A = dN/da, where dN is the number of particles on a sphere of area section measured in m-2.
c. A = dN/dm, where dN is the number of particles on a sphere of mass section measured in kg.
d. A = dN/dV, where dN is the number of particles on a sphere of volume section measured in m3.
e. A = dN/dE, where dN is the number of particles on a sphere of energy section measured in eV.
a. A = dN/dt, where dN is the expected value of the number of spontaneous nuclear transitions of that energy state in the time interval dt.
b. A = dN/da, where dN is the number of particles on a sphere of area section measured in m-2.
c. A = dN/dm, where dN is the number of particles on a sphere of mass section measured in kg.
d. A = dN/dV, where dN is the number of particles on a sphere of volume section measured in m3.
e. A = dN/dE, where dN is the number of particles on a sphere of energy section measured in eV.
a. A = dN/dt, where dN is the expected value of the number of spontaneous nuclear transitions of that energy state in the time interval dt.
b. A = dN/da, where dN is the number of particles on a sphere of area section measured in m-2.
c. A = dN/dm, where dN is the number of particles on a sphere of mass section measured in kg.
d. A = dN/dV, where dN is the number of particles on a sphere of volume section measured in m3.
e. A = dN/dE, where dN is the number of particles on a sphere of energy section measured in eV.
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Ed 
A resposta correta é a alternativa "a. A = dN/dt, where dN is the expected value of the number of spontaneous nuclear transitions of that energy state in the time interval dt." A atividade (A) de um material radioativo é definida como a taxa de decaimento radioativo, ou seja, a quantidade de desintegrações nucleares que ocorrem por unidade de tempo. A fórmula correta para calcular a atividade é A = dN/dt, onde dN é o número esperado de transições nucleares espontâneas do estado de energia no intervalo de tempo dt.
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