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ideas. Decibels are logarithmic values, so it’s not proper to add them by regular algebraic addition. See Appendix B for data on the cumulative results of multiple sound sources on the decibel stage. 9. Decibels Click here to match the decibel levels generated by familiar noise sources. 7. Sound PressureThe vibrations related to sound are detected as slight variations in strain. The vary of sound pressures perceived as sound is extraordinarily large, starting with a really weak pressure inflicting faint sounds and rising to noise so loud that it causes ache. When

 

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