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Question
50. Explain why it seems so difficult to reduce noise decibel levels even by a "small" amount, such as 5 or 6 decibels.ANS. In terms of absolute sound pressure level, a reduction in decibel level of 5 or 6 decibels is NOT really a "small" amount. Due to the logarithmic ratio scale, a reduction of noise level by only three decibels corresponds to a reduction in the absolute sound pressure level by a factor of two (that's cutting the sound pressure level IN HALF). A reduction of 6 dB corresponds to reducing the absolute sound pressure level by 75% (or a factor of four).
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