Given:
Lattice parameter, a = ![3.7589\times 10^{-8}cm](https://tex.z-dn.net/?f=3.7589%5Ctimes%2010%5E%7B-8%7Dcm)
![density, \rho = 8.772g/cm^{3}\\](https://tex.z-dn.net/?f=density%2C%20%5Crho%20%3D%208.772g%2Fcm%5E%7B3%7D%5C%5C)
Solution:
We know that for FCC, total no. of atoms in a crystal lattice = 4
let the number of atoms in Tin for alloying be 'n'
⇒ Total no. of Copper atoms in the alloy, = 4 - n
Also mass of Copper, m = 63.54 g/mol
atomic mass of Tin = 118.69 g/mol
We Know density of the crystal lattice is given by the formula:
(1)
where,
= Avagadro's number = ![6.23\times 10_{23}](https://tex.z-dn.net/?f=6.23%5Ctimes%2010_%7B23%7D)
Putting all the values in eqn (1), we get
![8.772 = \frac{118.69\times x\times (4 - n)\times 63.54}{(3.7589\times 10^{-8})^{3}\times 6.023\times 10^{23}}](https://tex.z-dn.net/?f=8.772%20%3D%20%5Cfrac%7B118.69%5Ctimes%20x%5Ctimes%20%284%20-%20n%29%5Ctimes%2063.54%7D%7B%283.7589%5Ctimes%2010%5E%7B-8%7D%29%5E%7B3%7D%5Ctimes%206.023%5Ctimes%2010%5E%7B23%7D%7D)
280.6 = 55.15n +254.16
n = 0.479 atoms/cell
Now to calculate the atomic percentage of Tin present in the alloy:
atomic percentage = ![\frac{no. of atoms in Tin/cell}{Total no. of atoms in FCC lattice}](https://tex.z-dn.net/?f=%5Cfrac%7Bno.%20of%20atoms%20in%20Tin%2Fcell%7D%7BTotal%20no.%20of%20atoms%20in%20FCC%20lattice%7D)
atomic % Tin present in alloy =
= ![0.1198\times 100](https://tex.z-dn.net/?f=0.1198%5Ctimes%20100)
atomic % Tin present in alloy = 11.98%
Answer:
Technician B only.
Explanation:
It is not necessary that all electric motors will use Direct current, some may also use Alternative current. Some electric motors that use DC may use brushes. There are two types of brushless motors that use alternative current.
Answer:
The claim is false and violate the zeroth law of thermodynamics.
Explanation:
Zeroth law of thermodynamics refers to thermal equilibrium among elements. It states that elements which different temperatures will reach the same temperature at the endgame if they are close enough to interact each other. This temperaure is called <em>equilibrium temperature and it is always a intermediate value between the element with highest temperature and the element with the lowest one. So there is no way </em> a cup of cold coffee on a table can warm up to 80°C picking up energy from the surrounding air at 25°C because the cup can only reach a temperature closer to the surrounding air temperature which will be the equilimbrium temperature for that case.
Answer:
Explanation:
A negative feedback influences the behavior of a system (i.e. a process) in the sense that control elements (controller) reverse the direction of the process by changing input conditions (action component) so that output can be set at a desired condition in order to fulfill safety, quality and cost-worthiness