1.Basic Acoustics

i.) What is sound?
ii.) What is a decibel (dB)?
iii.) How is sound measured?
iv.) What does dB(A) or "A-Weighted" mean?
v.) How do sound levels add?
vi.) At what level does sound become unsafe?
vii.) What is the sound power level?
viii.) How is sound power measured?
iv.) What is meant by loudness?