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 frequency range of sound (or, more accurately, of human hearing) is usually given as 0 Hz to 20 kHz, but our ears donât fuse very low frequency oscillations (0 Hz to 20 Hz, called the infrasonic range) into a pitch. Low frequencies just sound like beats.