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.
The project, Keep The Sound, highlights the damage caused by listening to high volumes for too long. It found the majority of young people are listening to music in excess of 91 decibels â higher than the maximum recommended level of 85 decibels. One in four played music at levels over 100 decibels. At this level of exposure, even 15 minutes a day could cause permanent damage. The effects of this damage may not be noticed until years later, when it is too late to correct the situation. Daily users of portable music players are particularly at risk.