The performance of fire alarm audible notification in a wide open space can be analyzed using a condition called free-field condition, where the sound pressure level (SPL) decreases roughly by a specific decibel value every time the distance from the source is doubled. Which of the following choices is the specific decibel value attributed to the free-field condition?
lengocho
4 months, 2 weeks agoChris_S723
10 months, 1 week agoasim990
10 months, 2 weeks agohowmany
1 year, 1 month ago