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 given question expects you to make a text analysis of first and second-hand evidence in texts through the use of pathos, logos, and ethos.
You should read and understand the texts you read and then try and identify what rhetorical devices are used.
A good tip is that ethos has to do with an expert's authority to convince
Pathos has to do with the use of emotions to convince and persuade.
Logos has to do with the use of logic to convince.
<h3>What is Pathos?</h3>
This refers to the rhetorical appeal that uses emotions to convince and persuade a person about a particular viewpoint.
Hence, we can see that The given question expects you to make a text analysis of first and second-hand evidence in texts through the use of pathos, logos, and ethos.
Read more about pathos here:
brainly.com/question/13118125
#SPJ1
False, quantitative data uses numbers
