during cost analysis you will also compare the proposed cost elements with i actual costs ii previous cost estimates for same or similar work iii other cost estimates iv independent government estimates and v forecasts of planned expenditures
How Decibels Apply to Music and Sound. In music, decibels are a measurement of Sound Pressure Level (SPL). When we say the speakers at a rock concert are playing at 110dB, what we really mean is that theyâre playing at 110dB SPL. Since the decibel is only a ratio, 110dB is actually a comparison to a different number: 0 SPL.
In extreme noise, the answer often is yes. The decibel scale is a logarithmic scale, not a linear scale. This means that every 3 dB drop in noise level (that is, 3 dB more attenuation in the hearing protection) reduces incoming noise by half.