Frequency, Wavelength, and Velocity

For many waves it is important to remember these points:






An important exception to these rules of thumb can be found in musical instruments. The musician generally excites a wide range of frequencies, but the frequencies that are sustained are those with wavelengths that are related to the length of the instrument. This is a resonance phenomenon, and the resonance frequency can be changed by changing the length of the instrument.

So, in a musical instrument: