The sound level L isWhereQ = Measured quantity of sound pressure or sound intensityQ0 = Reference standard quantity of sound pressure

\(20\frac{Q}{{{Q_0}}} + {\log _{10}}\frac{Q}{{{Q_0}}}\left( {bels} \right)\)

\({\log _{10}}\frac{{{Q_0}}}{Q}\left( {bels} \right)\)

\(20{\log _{10}}\frac{Q}{{{Q_0}}}\left( {bels} \right)\)

\({\log _{10}}\frac{Q}{{{Q_0}}}\left( {bels} \right)\)

The sound level L isWhereQ = Measured quantity of sound pressure or so

1.	The sound level L isWhereQ = Measured quantity of sound pressure or sound intensityQ0 = Reference standard quantity of sound pressure
A.	\({\log _{10}}\frac{{{Q_0}}}{Q}\left( {bels} \right)\)
B.	\(20{\log _{10}}\frac{Q}{{{Q_0}}}\left( {bels} \right)\)
C.	\({\log _{10}}\frac{Q}{{{Q_0}}}\left( {bels} \right)\)
D.	\(20\frac{Q}{{{Q_0}}} + {\log _{10}}\frac{Q}{{{Q_0}}}\left( {bels} \right)\)
Answer» D. \(20\frac{Q}{{{Q_0}}} + {\log _{10}}\frac{Q}{{{Q_0}}}\left( {bels} \right)\)