$(5$ pts $)2.$ A pipe with length $1\mathrm{.}20$ m is open at one end and closed at the other end. What is the wavelength of the first overtone standing wave for sound in the air column of the pipe?

$($a$)0\mathrm{.}96$ m

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

$($c$)1\mathrm{.}6$ m

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

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

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