OUTCOME
By the end of the lesson you will recognise the terms loudness, pitch and timbre and how they relate to the shape and size of a sound wave.
Sound waves are caused by the variation in air particles longitudinally but to illustrate a sound wave we illustrate the pressure variations. Pitch is the result of the frequency of the sound, loudness is reflected in a waves amplitude
Timbre is what makes the same pitch of a note sound different when made by different instruments. It is due to different wave shapes with the same frequency
LEARNING TASKS
Explain
What feature of a wave form is loudness associated with?
What is the difference in waveform of a low pitch sound to a high pitch sound/?
Why does middle C on a piano sound different to the same note played on a flute?
Evaluate
Make sure you answer the questions in the practical
Try questions 12 - 16
Reading for next lesson p.12 - 20