Answer:
a) λ = 0.0244 y⁻¹
b) 627 g
c) 11.8 years
d) 28.4 years
Explanation:
Strontium 90 is a radioactive material that decays according to the function
where,
A(t) is the amount present at time t (in years)
A₀ is the initial amount present
0.0244 is the decay rate λ
<em>Assume that a scientist has a sample of 800 grams of strontium 90. (a) What is the decay rate of strontium 90?</em>
<em>(a) What is the decay rate of strontium 90?</em>
According to the exponential decay function, the decay rate is λ = 0.0244 years⁻¹
<em>(b) How much strontium 90 is left after 10 years?</em>
If A₀ is 800 g and t is 10 years, A(t) is:
<em>(c) When will only 600 grams of strontium 90 be left?</em>
If A₀ is 800 g and A(t) is 600 g, t is:
<em>(d) What is the half-life of strontium 90?</em>
We can calculate half-life using the following expression.