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:
D. Interregional migration best describes a move from the suburbs to a nearby city.
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Despite popular belief, the U.S. Constitution does not provide for the popular election of the American president. It provides for popular election of presidential electors. Each candidate who qualifies for a given state's ballot must designate certain individuals who will serve as his or her electors if that candidate wins the popular vote in that state.
When each state certifies a winner of its overall popular vote, that winner is entitled to send all his or her electors to that state's Capitol, where they will officially record their votes for their candidate. All the electors in all the states do it on the same day, the first Monday after the second Wednesday of December. This year it is Dec. 19, which is the latest it can be, just as this year's Election Day is the latest it can be.
Answer:
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Answer:
M=0.09 mol/L
Explanation:
M=mol/volume
M=0.06 mol/0.656 L(convert 656 ml to L by ÷ by 1000)
M=0.09 mol/L
