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Chapters 7 and 9
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9.1 What is Sound?
9.1 Speed of Sound
9.1 How does sound travel through different media?
9.1 Why does sound travel faster in Solids than in Gases ?
How does sound travel ?
Can sound travel in a vacuum?
Absorption and Reflection of Sound
9.1 Why do we hear Echo's ?
9.1 Echo's
9.1 Using an Echo to measure the speed of sound
9.1 Working of a microphone and speaker
Mandy Harvey: "Try!"
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