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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: c) Taking
Explanation: 1.2.14 quiz correct answer
NATO and Warsaw Pact treaties derive their legitimacy from the Eastern bloc, and Western bloc.
<h3>How are the NATO and Warsaw Pact similar?</h3>
The Warsaw Pact is known to be a pact that is made up of the Eastern bloc, and NATO and its member countries is said to be made up of the Western bloc.
NATO and the Warsaw Pact are said to have similar ideology and they tend to built a lot of separate defenses in terms of beginning an arms race that was said to be in the Cold War.
Learn more about NATO from
brainly.com/question/4273334
