What unit measures oscillations of a wave form?

Hertz is the unit used to measure the frequency of a wave, specifically the number of oscillations or cycles that occur in one second. In the context of sound waves, frequency determines the pitch of the sound; higher frequencies correspond to higher pitches, while lower frequencies relate to lower pitches. This measurement is fundamental in both music and sound engineering, as it allows for the characterization of different sounds based on how many times the waveform oscillates per second.

Decibels, on the other hand, measure the intensity or loudness of a sound rather than its frequency. Amplitudes refer to the magnitude of the wave, which affects volume but not the frequency itself. Watts measure electrical power and do not relate to the oscillations of waves in this context. Therefore, the correct choice that directly corresponds to the measurement of oscillations in a waveform is Hertz.