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11.7 noise pollution - PowerPoint PPT Presentation


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- The higher the decibel, the louder is the sound.. p.99. Loudness of sound (??) . => The level of sound.. - measuring unit: decibel (??). - Can be measured with a decibel meter (???).. - The following photos show two different kinds of decibel meters:. very quiet sound. the lowest sound level that can be heard.

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