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?
Leelo
9 months, 1 week agolengocho
1 year, 6 months agoChris_S723
2 years agoasim990
2 years agohowmany
2 years, 3 months ago