SOUND

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	I.	INTRODUCTION
	II.	PHYSICAL CHARACTERISTICS
	A.	Frequency
	B.	Amplitude
	C.	Intensity
	D.	Quality
	E.	Speed of Sound
	F.	Refraction, Reflection, and Interference
	III.	SENSATIONS OF TONE
	A.	Three Important Types of Ordinary Sound
	IV.	HISTORICAL DEVELOPMENT
	A.	The 16th, 17th, and 18th Centuries
	B.	The 19th and 20th Centuries

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