O KEY CONCEPTS SUMMARY SECTION 2.1 Ask: If the drum were in a vacuum, would sound be produced when it was struck? No; sound needs a medium, ... Ask: What part of the drum vibrates, producing sound? the drum skin SECTION 2.2 Ask: If the frequency of the top wave is 200 hertz, what is ... How do you know ?
|Title||:||Waves, Sound and Light: . Teacher's ed|