일반물리학 1 — Waves-II: Problem 63

64 A well with vertical sides and water at the bottom resonates at 9.00 Hz and at no lower frequency. The air-filled portion of the well acts as a tube with one closed end (at the bottom) and one open end (at the top). The air in the well has a density of 1.10 kg/m³ and a bulk modulus of 1.33 × 10⁵ Pa. How far down in the well is the water surface?