$17-84$A $4\mathrm{.}0-$m$-$long pipe, open at both ends, is placed in a room where the temperature is T $=25$C$.$ A speaker capable of producing variable frequencies is placed at the open end and is used to cause the tube to resonate.

$($a$)$ What are the wavelength and the frequency of the fundamental frequency?

$1=[$ Select $]["2$ m$","3$ m$","1$ m$","6$ m$","7$ m$","8$ m$","5$ m$","4$ m$"]$

f$1=[$ Select $]["64\mathrm{.}8$ Hz$","151\mathrm{.}2$ Hz$","86\mathrm{.}4$ Hz$","129\mathrm{.}6$ Hz$","21\mathrm{.}6$ Hz$","43\mathrm{.}2$ Hz$","108\mathrm{.}0$ Hz$"]$

$($b$)$ What are the frequency and wavelength of the first overtone?

What is the length of the tube?