Link to our latest notes and resources: https://drive.google.com/drive/u/2/folders/15Ld6KabsL9x9X-t4GefBgSzXFDckJFa6 3.4 Sound 1 Describe the production of sound by vibrating sources 2 Describe the longitudinal nature of sound waves and describe compressions and rarefactions 3 State the approximate range of frequencies audible to humans as 20Hz to 20000Hz 4 Explain why sound waves cannot travel in a vacuum and describe an experiment to demonstrate this 5 Describe how changes in amplitude and frequency affect the loudness and pitch of sound waves 6 Describe how different sound sources produce sound waves with different qualities (timbres), as shown by the shape of the traces on an oscilloscope 7 Describe an echo as the reflection of sound waves 8 Describe simple experiments to show the reflection of sound waves 9 Describe a method involving a measurement of distance and time for determining the speed of sound in air 10 Know that the speed of sound in air is approximately 330–350m/s 11

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