PBS
Pbs: The Music Instinct: Good Vibrations! [Pdf]
Using the program "The Music Instinct," available on the PBS website, students will explore the nature of sound vibrations over two class periods.
Other
Univ. Of Leicester: Amplitude of Vibrations and Loudness
Discusses the ear drum receiving vibrations and how the amplitude of those vibrations translates into the loudness of the sound. Good diagrams to illustrate this concept.
Other
Gcse: Sound Pitch
Informational site on sound provides waveform illustrations of sound pitch. Provides additional information on ultrasounds, waves, reflection and much more.
Treehut
Suzy's World: Ears
Find out how your ears work and try an experiment involving your hearing.
Curated OER
Kids Health: Taking Care of Your Ears
An informative site that deals with the parts of the ear and their functions. Text is complemented with pictures.