For a $40wt\%Sh-60$ wi$\%Ph$ ailloy an $200C(392T),$

$($i$)$ How do you understand by phase diagram?

$($ii$)$ what phasers$)$ is $($are$)$ presehil?

$($iii$)$ What is $($are$)$ the composition$($s$)$ of the phase$($s$)?$

$($iv$)$ Calculate the relative amount of each phase present in terms of mass fraction and

$($v$)$ Calculate the relative amount of each phase present in terms of volume fraction.

At $200C,$ take the densities of $Pb$ and $Sn$ to be $10\mathrm{.}64\frac{g}{c}{m}^3$ and $6\mathrm{.}91\frac{g}{c}{m}^3,$ respectively.

See the Figure $1$ below and You can draw the line on question paper.

$(10$ Marks$)$