Question

A two end open pipe organ's 5th harmonic produces a frequency of 260 Hz. If it is 23 degrees Celsius, what is the length of the tube? (2 answers)

Fn=n(v/2L)

Fn=260 Hz
n=5
v=332+0.6(23)=345.8 m/s

I got 3.325 meters as the length, but it says there's two answers. Why is there two answers and what's the other answer?

Answer 1

Is it possible that the length of the tube is 1/2 wavelength, and one wavelength?

Answer 2

I don't understand why the length would be 1/2 the wavelength and one wavelength. I thought that was only for the fourth and second harmonics.