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Noreturn
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Homework Statement
Homework Equations
So I need that in micrograms tho. So 4402*10^-18/1000=4.4*10^-18kg. or 4.4*10^-12 micrograms
that stills say it's wrong tho.
I asked about the bequerel because your λ is in terms of years.Noreturn said:BUT bequerel is s^-1 @ 10^-6 so answer is 4.4micrograms?
Not in this equation. Just do what I suggested.Noreturn said:Do I need to divide by Avogadro constant?
I agree, but when you start with the equation A = λ N, then you say A = 4*10^9Bq, that "A" is the final A and the number N = 9.56*10^17 that you get from it is the final N. So, what is the initial N that should be larger than 9.56*10^17? That's why I suggested that you find the initial activity in post #2.Noreturn said:The Initial should be bigger.
I prefer to look at it this way: If you have N atoms of atomic weight AW, the mass of the sample is given byNoreturn said:Just realized I may have had it right but I forgot to convert the kg to g. So my answer should have been 6.28ug
Half life refers to the amount of time it takes for half of a substance to decay or disappear. It is a measure of the stability of a substance and is often used in radioactive decay and other natural processes.
The calculation for half life involves using the equation t1/2 = ln(2)/λ, where t1/2 is the half life, ln(2) is the natural logarithm of 2, and λ is the decay constant. The decay constant can be found by dividing the natural logarithm of the initial amount of the substance by the time it took for that amount to decrease by half.
Knowing the half life of a substance allows scientists to calculate the rate at which it decays. By measuring the amount of the substance remaining after a certain amount of time has passed, they can use the half life equation to determine the initial mass of the substance.
The half life of a substance is considered to be a constant value, meaning it does not change over time. However, some external factors such as temperature, pressure, and chemical reactions can affect the rate of decay and therefore alter the observed half life.
Half life calculations are commonly used in fields such as nuclear physics, archaeology, and medicine. They can help determine the age of artifacts, track the spread of medical isotopes in the body, and measure the stability of radioactive materials.