o.
IV. Long answer type questions
3. What are loudness'and'pitch' of a sound? What physical characteristics are they related to?
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Sound waves are changes in pressure generated by vibrating molecules. The physical characteristics of sound waves influence the three psychological features of sound: loudness, pitch, and timbre. Loudness depends on the amplitude,or height, of sound waves. The greater the amplitude, the louder the sound perceived.17-Sep-2020
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