a$)$ Calculate the phase ratio for a $30$m by $0\mathrm{.}2$mm diameter capillary column coated with a $0\mathrm{.}5$micrometer film of stationary phase

b$)$ If a similar column uses a $2\mathrm{.}0$ micrometer of the same stationary phase, how will k$\text{'}$ change?

c$)$ Will tm differ between columns$($a$)$ and $($b$)$ if operated the same way?

$($d$)$ if tm for the column in a is $1\mathrm{.}5$min and peak has a tr on it of $3\mathrm{.}5$ min, what will be the tr of that peak on the column in $($b$)?$