The wavelength of a longitudinal wave could also be measured from the centre of a rarefaction to the centre of the next rarefaction. Frequency – the number of vibrations in one second.

The unit of frequency is hertz (Hz)., wavelength close wavelength The length of a single wave, measured from one wave peak to the next. and the speed of water waves.

Sound is propagated in the form of longitudinal waves. When sound travels from one medium to another, both its velocity and wavelength undergo changes. <div class ...