Greenacres, WA Land Info. Washington is the country's 18th largest agricultural state. In 2014, the agricultural sector contributed $7.53 billion to the Washington economy, or two percent of overall state GDP (placing it eighth among all U.S. states for the size of its farm economy).
Zero decibels is the threshold of human hearing, 40 to 50 decibels is normal for a peaceful neighborhood, 70 to 80 decibels is the level adjacent to a busy urban street or 50 feet from a major freeway, and 120 to 140 decibels is a typical level at which sound is painful.ero decibels is the threshold of human hearing, 40 to 50 decibels is normal for a peaceful neighborhood, 70 to 80 decibels is the level adjacent to a busy urban street or 50 feet from a major freeway, and 120 to 140 decibels is a typical level at which sound is painful.
The decibel (abbreviated dB) confuses many people, perhaps because they assume it is an absolute unit or level of sound. The dB is not a unit in the sense that a metre or a kilogram are well-defined units of distance and weight.A decibel is the relationship or ratio between two sound levels, for example the measured sound pressure level and the minimum sound pressure level a person with good hearing can detect.imilarly if we had doubled the sound power i.e. two machines, then the measured increase would only be 3 dB. In the first case we had 10 times as much power and the log of 10 is 1 bel or 10 dB. Similarly twice as much power or a factor of 2 gives a log of 0.3 bels or 3 dB.