How do wind chimes control pitch?

Wind chimes control pitch through the length and shape of the tubes or rods that they are made of. The longer the tube or rod, the lower the pitch it will produce. This is because the longer the tube or rod, the slower the speed at which the sound waves travel through it, and the lower the frequency of the sound. The shape of the tube or rod also affects the pitch, with a wider tube or rod producing a higher pitch than a narrower one. This is because the wider the tube or rod, the more air it can move, and the faster the speed at which the sound waves travel through it, and the higher the frequency of the sound.