Intro: Science of Sound A. Sound • Sound as vibration (air molecules) sound made but not necessarily heard • Sound as perception sound is heard and interpreted in the mind Any definition of music will require a combination of the both listed types of sounds listed above B. Vibration • Irregular objects DO NOT vibrate well flat & quickly gone (ex: kitchen table) • Regular objects vibrate well (ex: guitar or violin string) C. Sound wave • Passing of a vibrational energy through a medium such as air, water etc • Compression wave energy is squeezed and then stretched • Ocean waves transverse waves energy moves from side to side • The medium lighter than air(helium) squeakier the voice • The medium heavier than air(sulfur hexafluoride) deeper the voice D. Every sound wave is different • Yet they travel at the same speed • Vary according to altitude • At sea level 340m/s • The farther the sound travels the softer is gets
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