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Chapter 12

Chapter 12. SOUND. SOUND. SOUND. Sound Waves are longitudinal waves: The particles of the medium through which it propagates oscillates in the same direction along which the waves travel. Vibrating objects produce sound: guitar strings, speakers etc.

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Decibel ( dB)

Decibel ( dB). dB is a logarithmic value that expresses difference and not absolute values A corresponding reference scale is required For sound, sound-pressure level ( SPL ) is used as the reference scale (dB SPL) The threshold of hearing (0 dB SPL) is used as the reference or zero point.

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0 db threshold - PowerPoint PPT Presentation

Chapter 12

Decibel ( dB)