![]() For example, 110 vibrations per second (110 Hz) is the frequency of vibration of the A string on a guitar. The pitch of a note is almost entirely determined by the frequency: high frequency for high pitch and low for low. The number of vibrations per second is called the frequency which is measured in cycles per second or Hertz (Hz). Ultimately this sound wave causes a very tiny vibration in your eardrum - but that's another story.Īt any point in the air near the source of sound, the molecules are moving backwards and forwards, and the air pressure varies up and down by very small amounts. The disturbance in the air spreads out as a travelling sound wave. Some of this air flows outwards, compressing the next layer of air. ![]() When it moves forwards, it compresses the air next to it, which raises its pressure. First, something about sound If you put your finger gently on a loudspeaker you will feel it vibrate - if it is playing a low note loudly you can see it moving.
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