for a given light exposure for photolithography with $=248$ mm$,$ d $0\mathrm{.}5$ um and s $=10$ um$,$ calculate the b distances values for contact and proximity printing and comments on it

Problem $4.$

$($a$)$ Obtain the time constant, $,$ of the following model. $(5$ points$)$

$8x^{}+4x=100$

$($b$)$ For the model in Part $($a$),$ how long it will take the response to reach steady$-$state? $(5$ points$)$

Appendix: Percent maximum overshoot $M_O(\%)$as functions of the damping ratio, $.$

$($a$)$

Page $6$ of $6$