Answer:
a) D = 4.88 * 10^(-14) m^2 / s
b) <em>t </em>= 1.1 hr
Solution:
a) Magnesium in Aluminum diffusion:
D = Do * exp(-Qd / RT)
= (1.2 * 10^(-4) m^2 / s) * exp ( - 130,000 / 8.31 * 723.15)
= 4.88 * 10^(-14) m^2 / s
D = 4.88 * 10^(-14) m^2 / s
b) The composition remains same at say the distance Xo:
(Cx - Co) / (Cs - Co) = Constant
Xo^2 / D_{550} * <em>t </em>= Xo^2 / D_{450} * 15
D_{550} * <em>t </em>= D_{450} * 15
(1.2 * 10^(-4) m^2 / s) * exp ( - 130,000 / 8.31 * 723.15) * <em>t</em>
(4.88 * 10^(-14) m^2 / s) * 15
by, solving for <em>t </em>we get:
<em>t </em>= 1.1 hr
So, the time required is 1.1 hr.
When in slide show mode, the menu bar and that "x" are not visible.
The effectiveness of using thicker bags are:
- It has the lowest environmental impact in terms of any other disposable bag.
- It can be used three to six more times.
- It is environmentally sustainable.
<h3>What is the effect of thicker plastic bags have on the environment?</h3>
The use of plastic bags is known to have some form of detrimental effects on the such as animal choking, pollution, and others.
Conclusively, Note that thicker bags needs a lot of plastic to be able to produce it and it goes to waste even if a person do not use it again.
Learn more about environment from
brainly.com/question/17413226
A digital pen is a battery-operated writing instrument that allows the user to digitally capture a handwritten note or drawing. Typically, a digital pen comes with a Universal Serial Bus (USB) cradle to let the user upload the handwritten notes to a personal computer (PC).
Sometimes called a smart pen or stylus.
No it's actually the opposite. so False.
