A wave on a string is described by$$y$($x$,$t$)=(1\mathrm{.}5$cm$)$sin$[2$$($x$0\mathrm{.}3$m$+$t$0\mathrm{.}4$s$)+0\mathrm{.}1].$

c$)$ Now assume the string is fixed on both ends.$$ How long must the string be in order to produce a second$-$mode standing wave?$$ Answer in m$.$