It’s aLL of the above Bc it cramped
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
The answer is the second choice, because (9) X 3 = 27.
I wish i could but unfortunately i can’t. see you in the afterlife
Answer:
Why USSR invaded Afghanistan?
Afghanistan Had Long Held Strategic Importance . Fearful that Tsarist Russia's expansion into Central Asia would bring it perilously close to the border of India, their imperial jewel, Britain fought three wars in Afghanistan to maintain a buffer against Russian encroachment.
It's impact on Afghanistan and Pakistan: In the brutal nine- year conflict, an estimated one million civilians were killed as well as 90,000 Mujahideen fighters and 1,800 Afghan troops. The county was left in ruins. Several million Afghan had either fled to Pakistan for refuge or had become internal refugees.
