$(5pts)3.$ A pipe has length $1\mathrm{.}20$ m and is open at one end and closed at the other. What is the wavelength of the fundamental standing wave for the air column that is in the pipe?

$($a$)0\mathrm{.}30$ m

$($b$)0\mathrm{.}60$ m

$($c$)1\mathrm{.}2$ m

$($d$)1\mathrm{.}8$ m

$($e$)2\mathrm{.}4$ m

$($f$)4\mathrm{.}8$ m

$($g$)$ none of the above answers