Ko te maha o ngā tōiriiri o tētahi ngaru oro ka hipa i tētahi pūwāhi i ia hākona, koia hei tohu i te tīkā, i te mārū rānei o te oro. Ko te Hertz (Hz) te waeine mō te auau. Rangona ai e te taringa tangata ngā oro mai i te 20Hz ki te 20,000Hz. E 261.6Hz te auau o C waenga.
The number of sound waves which pass a point every second which determines the pitch of the sound. Wave frequency is measured in Hertz (Hz). The human ear can hear sound waves within the range of 20Hz to 20,000Hz. The frequency of middle C is 261.6Hz.