Answer
a) 3.75 meters
b) 7.5 meters
Work Step by Step
We first must find the wavelength:
$\lambda=\frac{v}{f}=\frac{330}{22}=15\ m$
a) Since the pipe is closed at an end, the fundamental frequency requires a length 1/4 of the length of the pipe, which is: $15 \times \frac{1}{4}=3.75\ m$
b) Since the pipe is open at both ends, the fundamental frequency requires a length 1/2 of the length of the pipe, which is: $15 \times \frac{1}{2}=7.5\ m$
