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The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly sensitive. Our ears can hear everything from your fingertip.brushing lightly over your skin to a loud jet engine. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level.
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If the 4-digit number x67y is exactly divisible by 9, then the least value of (x + y) is _____.
Two circles touch each other externally at P. AB is a direct common tangent to the two circles, A and B are points of contact, and ∠ PAB = 40° . The...
The length of a width is 21 cm and the side of a square is 25 cm less than the length and width of the rectangle. If perimeter of the rectangle is 30 cm...
