Loudness and Pitch: Grade 10 Waves and Light

In this lesson, it is demonstrated, with the use of an oscilloscope, how the amplitude of a sound wave is related to the loudness of sound, and the pitch to its frequency. We see that particles squeezed into areas of high pressure (compressions) and low pressure (rarefactions) are what make longitudinal waves, like sound. The bigger the difference in pressure, the greater the amplitude and we hear this as loudness.