length 2.74 m
pitch 116.5 Hz
116.5 × 2.74 = 319every single time
watch for this
f × L = 319 Hz·m on one lip setting (rung 2). Double the tube, halve the pitch.
Every position gives a different length and a different pitch, but multiply them together and you always land on the same number. That is what inverse proportion means, and the trombone is the only instrument in the room where you can slide along the graph by hand.
The full lesson behind this: The trombone →