1. Open Air Columns Closed Air Columns
Antinodes  Open End Nodes  Closed End
n is the harmonic #
Occurs for all harmonics: 1, 2, 3, 4, 5 … Only occurs with odd harmonics: 1, 3, 5 …

2. Musical Notes & Frequencies
(Divide your frequency by 2 to raise it up an octave.)
C4 262
D 294
E 330
F 349
F#/Gb 367
G 392
A 440
A#/Bb 466
B 494
C5 523

4. Musical Notes & Frequencies
C4 261.63
D 293.66
E 329.63
F 349.23
F#/Gb 369.99
G 392.00
A 440.00
A#/Bb 466.16
B 493.88
C5 523.25

5. Musical Notes & Frequencies
C4 261.63
D 293.66
E 329.63
F 349.23
F#/Gb 369.99
G 392.00
A 440.00
A#/Bb 466.16
B 493.88
C5 523.25