Question

The Length of an organ pipe is twice is the length of another closed organ pipe . The fundamental frequency of the open pipe is 100Hz. the frequency of the third harmonic of the closed pipe is?

Answer 1

If the long pipe is open on both sides, and the small one is closed on two sides, then

$1.5\lambda _c = 0.25\lambda _o$

respectively $\nu _c = 6\nu _o = 600 (Hz).$