The time it takes for 1g of strontium-90 to decay to 250 mg is; 57.6 years
<h3>What is the half life of an element?</h3>
The formula for half life is;
A(t) = A₀ * (¹/₂)^(t/t_1/2)
Where;
A(t) is amount left after t years
A₀ the initial quantity of the substance that will undergo decay;
t_1/2 is the half-life of the decaying quantity.
We are given;
t_1/2 = 28.8 years
A₀ = 1 g
A(t) = 250 mg = 0.25 g
Thus;
0.25 = 1 * (¹/₂)^(t/28.8)
log 0.25 = (t/28.8) log (1/2)
-0.60206 = (t/28.8) * -0.3010
t = 2 * 28.8
t = 57.6 years
Read more about half life at; brainly.com/question/11152793
Answer:
How many hours you need to spend on studying for AP tests every week is going to depend a lot on how much material you need to review and how comfortable you are with the format of the exam questions. In general, though, you should expect to study for several hours a week split over two to three sessions.
Explanation:
The amount of damage and/or impact there was
Schizophrenia is the answer.
Hello. You forgot to add this part to your question:
The goal is to evaluate and express your personal entertainment level in the following areas: Story Plot Main Characters Plausibility Special Effects
Answer and Explanation:
The chosen film was: The breakfast Club.
The breakfast Club was a film produced in 1985 and tells the story of five teenagers who had some kind of bad behavior at school and had to spend an entire Saturday in detention. These teenagers do not know each other and are part of totally different groups and live different realities as well. At first the plot seems simple, but it becomes very profound when the characters begin to tell their dramas and interact with each other, even in the midst of their differences. Detention becomes a type of "group therapy" and it's amazing to see how the characters manage to let go with real people, who have problems.
The film is extremely plausible in most factors, especially when it shows that even with the moment of complicity that teenagers have, they will not maintain their friendship, as they are very different from each other.
As the film takes place in the real world and portrays real dramas, special effects were not used, but this does not diminish the quality of the film, which establishes itself as fun, dramatic and full of layers with different meanings.
