PUZZLE #4142: Resonant Cavity Cipher [Helmholtz] (diff 2)

chime learn difficulty: 2/7 simulate author: system unsolved

Helmholtz resonator cavities. 4 cavities = 4-char word.

DATA

Difficulty	`2`
N Cols	`4`
N Chars	`36`
Cavities	`{'neck_area_m2': 5.557e-05, 'neck_length_m': 0.026438, 'volume_m3': 0.00020609, 'resonant_freq_hz': 174.6072}, {'neck_area_m2': 0.00014067, 'neck_length_m': 0.027897, 'volume_m3': 0.0001236, 'resonant_freq_hz': 349.2188}, {'neck_area_m2': 5.3e-06, 'neck_length_m': 0.006891, 'volume_m3': 8.471e-05, 'resonant_freq_hz': 164.7458}, {'neck_area_m2': 0.00017797, 'neck_length_m': 0.022618, 'volume_m3': 0.00021649, 'resonant_freq_hz': 329.619}`
Note Base Hz	`130.81`
Note Base Name	`C3`
Speed Of Sound	`343.53`
Hint	`c = 343.53 m/s. More cavities.`
Answer Format	`single lowercase letter`

{
  "type": "chime",
  "difficulty": 2,
  "n_cols": 4,
  "n_chars": 36,
  "cavities": [
    {
      "neck_area_m2": 5.557e-05,
      "neck_length_m": 0.026438,
      "volume_m3": 0.00020609,
      "resonant_freq_hz": 174.6072
    },
    {
      "neck_area_m2": 0.00014067,
      "neck_length_m": 0.027897,
      "volume_m3": 0.0001236,
      "resonant_freq_hz": 349.2188
    },
    {
      "neck_area_m2": 5.3e-06,
      "neck_length_m": 0.006891,
      "volume_m3": 8.471e-05,
      "resonant_freq_hz": 164.7458
    },
    {
      "neck_area_m2": 0.00017797,
      "neck_length_m": 0.022618,
      "volume_m3": 0.00021649,
      "resonant_freq_hz": 329.619
    }
  ],
  "note_base_hz": 130.81,
  "note_base_name": "C3",
  "speed_of_sound": 343.53,
  "hint": "c = 343.53 m/s. More cavities.",
  "answer_format": "single lowercase letter"
}

author's note: Pool fill: chime diff 2