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Sound Waves: Explanation, Review, and Examples - Albert
The Nature of Sound – The Physics Hypertextbook
Physics Tutorial: Pitch and Frequency - The Physics Classroom
Sound - IGCSE Physics - BBC Bitesize
Understanding Sound Waves and How They Work - HowStuffWorks
Sound Waves - BBC Bitesize
1.6: Longitudinal Waves - Physics LibreTexts
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Physics Tutorial: Longitudinal Sound Wave - The Physics Classroom