The wavelength can be defined and explained as the distance existing between different sound waves, while frequency, on the other hand, is defined as the number of times in which a sound wave occurs. Wavelength is usually applied and used in the measurement of the length of different sound waves, frequency on the contrast is basically, used in the measurement of the recurrence of the sound waves.
The wavelength can actually be determined based on or depending on the crests, the troughs, or the zero crossings through which the sound passes, frequency, on the other hand, can also be determined by the numbers of times the sound hits the peak or a trough.
Wavelength is the measure of distance, while frequency on the other is the measure of time. The International System of Units (SI) unit of the wavelength is the meter (m), while that of a frequency is the hertz (Hz).